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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
GA-8VM800PMD-775-RH
I'm trying to mix a 1gb stick, with a 512mb stick. But I only get a total of 1gb, instead of 1.5gb, as expected. Can't find anything about "all sticks must be the same size" on the Gigabyte site. http://www.gigabyte.us/Products/Moth...ProductID=2333 Same problem with BIOS version F5... and BIOS F6. (I also tried swapping the stick positions.) Any idea on how to get 1.5gb total? I really can't afford to keep buying more and more memory... and throwing existing memory in the garbage. I *ONLY* want/need 1.5gb total. Do I need to change any BIOS settings? Move any jumper pins? (I'm using Windows-XP with all the latest updates.) Thanks. |
#2
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
"A_Michigan_User" wrote:
GA-8VM800PMD-775-RH I'm trying to mix a 1gb stick, with a 512mb stick. But I only get a total of 1gb, instead of 1.5gb, as expected. Can't find anything about "all sticks must be the same size" on the Gigabyte site. http://www.gigabyte.us/Products/Moth...ProductID=2333 Same problem with BIOS version F5... and BIOS F6. (I also tried swapping the stick positions.) Any idea on how to get 1.5gb total? I really can't afford to keep buying more and more memory... and throwing existing memory in the garbage. I *ONLY* want/need 1.5gb total. Do I need to change any BIOS settings? Move any jumper pins? (I'm using Windows-XP with all the latest updates.) Thanks. Hardware is documented to different degrees, and it is harder to give advice in some cases, than in others. I got lucky this time, because I see a note on the Gigabyte specification page. It says: "Note2: Use of a Double-Sided memory module (the single chip is 512 Mbit) is required if you wish to install a 1 GB memory module." That sounds like they are recommending the following configuration. (16) 64Mx8 chips (the chip density is 512 megabits each) It is also possible for a DIMM maker, to use 1024 megabit chips. Gigabyte is warning that this configuration would only be half-recognized. ( 8) 128Mx8 chips (the chip density is 1024 megabits each) The addresses sent to chips, are multiplexed. There is a Row address and a Column address, and they access the 128 meg address space. Row*Column must have enough bits, to access 128 million locations. Gigabyte is hinting, that there aren't enough Row*Column bits, to access into 128 meg addresses, but there are enough for 64 meg addresses. If the hardware can only access 64 out of 128 million locations, the RAM will be half-detected. 512MB + (1/2 * 1024MB) = 1024MB total My guess is, your 1GB module is single sided ? It should be double sided, with 16 chips. I'm basing my answer, on that single sentence on the Gigabyte site. (I do not expect to find documentation anywhere from VIA, the chipset maker, on this matter. Intel, on the other hand, has better documentation for their chipsets, which you can download.) If you get your memory here (or buy this part number from some retailer), you should get the correct formulation. In general, as a consumer, you don't normally get a say as to how many chips are used - only a few makers provide detailed info on their products. http://www.crucial.com/store/listpar...M800PMD-775-RH A single 1GB stick is $13 here. I don't know what shipping would be. At this price, you could buy two. http://www.newegg.com/Product/Produc...k=CT12864AA667 If I look on the Kingston site, this is as close as I can get to your model number. http://www.ec.kingston.com/ecom/conf...sp?SysID=29258 "This system is limited to double-sided 16 chip DIMMs using 512Mbit (64Mx8) DRAM. Kingston may ship single-sided 8 chip version DIMMs which are not compatible with this board." Note that they warn that they may accidentally ship the wrong product, if you order a 1GB stick, since their supplier could provide an 8 chip or a 16 chip module. Therefore, they chose not to sell a 1GB module in this case! That is why that size is missing from their listing. Kingston knows the board can take a 1GB stick, but their product formulations are not precise enough in this case, to avoid a potential problem. So that means, in this case, I'd "gamble" on the Crucial product, because they seem to have their act together. Even if you shop in person (i.e. went to the Best Buy and had a look at their modules), products have enough packaging material around them, you can't always tell what chip configuration is present. So no matter where you buy this from, or how you do it, there will be some degree of risk. Not all VIA chipsets are like this - I have a VIA chipset on my motherboard, and it takes 1GB or 2GB sticks. So if I happened to pop in an 8 chip, 1GB module, it would work fully. HTH, Paul |
#3
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
Thanks!
The 1gb stick I already have is this one: http://www.newegg.com/Product/Produc...82E16820144151 So... do I buy another 1 of those... (and throw out BOTH of my 512mb sticks). Or do I buy your suggestion (and throw out BOTH of my 512mb sticks... and my current 1gb stick too!) Ugh. "Paul" wrote in message ... "A_Michigan_User" wrote: GA-8VM800PMD-775-RH I'm trying to mix a 1gb stick, with a 512mb stick. But I only get a total of 1gb, instead of 1.5gb, as expected. Can't find anything about "all sticks must be the same size" on the Gigabyte site. http://www.gigabyte.us/Products/Moth...ProductID=2333 Same problem with BIOS version F5... and BIOS F6. (I also tried swapping the stick positions.) Any idea on how to get 1.5gb total? I really can't afford to keep buying more and more memory... and throwing existing memory in the garbage. I *ONLY* want/need 1.5gb total. Do I need to change any BIOS settings? Move any jumper pins? (I'm using Windows-XP with all the latest updates.) Thanks. Hardware is documented to different degrees, and it is harder to give advice in some cases, than in others. I got lucky this time, because I see a note on the Gigabyte specification page. It says: "Note2: Use of a Double-Sided memory module (the single chip is 512 Mbit) is required if you wish to install a 1 GB memory module." That sounds like they are recommending the following configuration. (16) 64Mx8 chips (the chip density is 512 megabits each) It is also possible for a DIMM maker, to use 1024 megabit chips. Gigabyte is warning that this configuration would only be half-recognized. ( 8) 128Mx8 chips (the chip density is 1024 megabits each) The addresses sent to chips, are multiplexed. There is a Row address and a Column address, and they access the 128 meg address space. Row*Column must have enough bits, to access 128 million locations. Gigabyte is hinting, that there aren't enough Row*Column bits, to access into 128 meg addresses, but there are enough for 64 meg addresses. If the hardware can only access 64 out of 128 million locations, the RAM will be half-detected. 512MB + (1/2 * 1024MB) = 1024MB total My guess is, your 1GB module is single sided ? It should be double sided, with 16 chips. I'm basing my answer, on that single sentence on the Gigabyte site. (I do not expect to find documentation anywhere from VIA, the chipset maker, on this matter. Intel, on the other hand, has better documentation for their chipsets, which you can download.) If you get your memory here (or buy this part number from some retailer), you should get the correct formulation. In general, as a consumer, you don't normally get a say as to how many chips are used - only a few makers provide detailed info on their products. http://www.crucial.com/store/listpar...M800PMD-775-RH A single 1GB stick is $13 here. I don't know what shipping would be. At this price, you could buy two. http://www.newegg.com/Product/Produc...k=CT12864AA667 If I look on the Kingston site, this is as close as I can get to your model number. http://www.ec.kingston.com/ecom/conf...sp?SysID=29258 "This system is limited to double-sided 16 chip DIMMs using 512Mbit (64Mx8) DRAM. Kingston may ship single-sided 8 chip version DIMMs which are not compatible with this board." Note that they warn that they may accidentally ship the wrong product, if you order a 1GB stick, since their supplier could provide an 8 chip or a 16 chip module. Therefore, they chose not to sell a 1GB module in this case! That is why that size is missing from their listing. Kingston knows the board can take a 1GB stick, but their product formulations are not precise enough in this case, to avoid a potential problem. So that means, in this case, I'd "gamble" on the Crucial product, because they seem to have their act together. Even if you shop in person (i.e. went to the Best Buy and had a look at their modules), products have enough packaging material around them, you can't always tell what chip configuration is present. So no matter where you buy this from, or how you do it, there will be some degree of risk. Not all VIA chipsets are like this - I have a VIA chipset on my motherboard, and it takes 1GB or 2GB sticks. So if I happened to pop in an 8 chip, 1GB module, it would work fully. HTH, Paul |
#4
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
I'm also finding that very few stores tell you the "actual number of chips".
(Why is that info missing? That's apparently extremely important.) I apparently need "16 chips". If a 1gb stick says "128m x 64" can I be certain that it will have 16 chips? ""A_Michigan_User"" wrote in message ... Thanks! The 1gb stick I already have is this one: http://www.newegg.com/Product/Produc...82E16820144151 So... do I buy another 1 of those... (and throw out BOTH of my 512mb sticks). Or do I buy your suggestion (and throw out BOTH of my 512mb sticks... and my current 1gb stick too!) Ugh. "Paul" wrote in message ... "A_Michigan_User" wrote: GA-8VM800PMD-775-RH I'm trying to mix a 1gb stick, with a 512mb stick. But I only get a total of 1gb, instead of 1.5gb, as expected. Can't find anything about "all sticks must be the same size" on the Gigabyte site. http://www.gigabyte.us/Products/Moth...ProductID=2333 Same problem with BIOS version F5... and BIOS F6. (I also tried swapping the stick positions.) Any idea on how to get 1.5gb total? I really can't afford to keep buying more and more memory... and throwing existing memory in the garbage. I *ONLY* want/need 1.5gb total. Do I need to change any BIOS settings? Move any jumper pins? (I'm using Windows-XP with all the latest updates.) Thanks. Hardware is documented to different degrees, and it is harder to give advice in some cases, than in others. I got lucky this time, because I see a note on the Gigabyte specification page. It says: "Note2: Use of a Double-Sided memory module (the single chip is 512 Mbit) is required if you wish to install a 1 GB memory module." That sounds like they are recommending the following configuration. (16) 64Mx8 chips (the chip density is 512 megabits each) It is also possible for a DIMM maker, to use 1024 megabit chips. Gigabyte is warning that this configuration would only be half-recognized. ( 8) 128Mx8 chips (the chip density is 1024 megabits each) The addresses sent to chips, are multiplexed. There is a Row address and a Column address, and they access the 128 meg address space. Row*Column must have enough bits, to access 128 million locations. Gigabyte is hinting, that there aren't enough Row*Column bits, to access into 128 meg addresses, but there are enough for 64 meg addresses. If the hardware can only access 64 out of 128 million locations, the RAM will be half-detected. 512MB + (1/2 * 1024MB) = 1024MB total My guess is, your 1GB module is single sided ? It should be double sided, with 16 chips. I'm basing my answer, on that single sentence on the Gigabyte site. (I do not expect to find documentation anywhere from VIA, the chipset maker, on this matter. Intel, on the other hand, has better documentation for their chipsets, which you can download.) If you get your memory here (or buy this part number from some retailer), you should get the correct formulation. In general, as a consumer, you don't normally get a say as to how many chips are used - only a few makers provide detailed info on their products. http://www.crucial.com/store/listpar...M800PMD-775-RH A single 1GB stick is $13 here. I don't know what shipping would be. At this price, you could buy two. http://www.newegg.com/Product/Produc...k=CT12864AA667 If I look on the Kingston site, this is as close as I can get to your model number. http://www.ec.kingston.com/ecom/conf...sp?SysID=29258 "This system is limited to double-sided 16 chip DIMMs using 512Mbit (64Mx8) DRAM. Kingston may ship single-sided 8 chip version DIMMs which are not compatible with this board." Note that they warn that they may accidentally ship the wrong product, if you order a 1GB stick, since their supplier could provide an 8 chip or a 16 chip module. Therefore, they chose not to sell a 1GB module in this case! That is why that size is missing from their listing. Kingston knows the board can take a 1GB stick, but their product formulations are not precise enough in this case, to avoid a potential problem. So that means, in this case, I'd "gamble" on the Crucial product, because they seem to have their act together. Even if you shop in person (i.e. went to the Best Buy and had a look at their modules), products have enough packaging material around them, you can't always tell what chip configuration is present. So no matter where you buy this from, or how you do it, there will be some degree of risk. Not all VIA chipsets are like this - I have a VIA chipset on my motherboard, and it takes 1GB or 2GB sticks. So if I happened to pop in an 8 chip, 1GB module, it would work fully. HTH, Paul |
#5
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
"A_Michigan_User" wrote:
I'm also finding that very few stores tell you the "actual number of chips". (Why is that info missing? That's apparently extremely important.) I apparently need "16 chips". If a 1gb stick says "128m x 64" can I be certain that it will have 16 chips? That is the problem. The 128m x 64 is actually meaningless. It is a "window dressing" that does not help customers. It is intended to make the advert look technical. ******* When I looked at your Kingston item on Newegg, then looked at the picture, I see the back of the module has no chips. So that one is an 8 chip module. An 8 chip 1GB module, on that motherboard, will only be half-detected. (No chips on back of module) http://images17.newegg.com/is/image/newegg/20-144-151-S02?$S640W$ Buy the Crucial one instead. You can buy it straight from Crucial, as they're more likely to help you if there is a problem with the product. The Newegg picture, did not remove the module from the packaging, so we can't look at the back of it. But if Crucial says it works, then it works. Paul |
#6
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
Paul,
Maybe it would help if I understood the math instead. 128m x 64... in order to get 1gb... wouldn't it *HAVE TO BE* 16 chips? No? I thought 128m x 64 was the memory available in each chip. No? I've already bought my "wrong" memory from NewEgg... so (if they allow me to exchange it)... I'd like to buy the "correct" stuff also from NewEgg. I really hate to shop by "what the picture might look like"... but I guess I'll have to in this case. I was *SO* careful to try and buy the right stuff: 1gb (all on 1 stick, not 2) DDR2 DIMM Avoid laptop memory 533/400 Unbuffered Not dual-channel Not ECC 240-pin PC2-4200 Big name manufacturer Big name store Low price Free shipping I even made sure it was 1.8 volt Results? The wrong memory anyway. Ugh. "Paul" wrote in message ... "A_Michigan_User" wrote: I'm also finding that very few stores tell you the "actual number of chips". (Why is that info missing? That's apparently extremely important.) I apparently need "16 chips". If a 1gb stick says "128m x 64" can I be certain that it will have 16 chips? That is the problem. The 128m x 64 is actually meaningless. It is a "window dressing" that does not help customers. It is intended to make the advert look technical. ******* When I looked at your Kingston item on Newegg, then looked at the picture, I see the back of the module has no chips. So that one is an 8 chip module. An 8 chip 1GB module, on that motherboard, will only be half-detected. (No chips on back of module) http://images17.newegg.com/is/image/newegg/20-144-151-S02?$S640W$ Buy the Crucial one instead. You can buy it straight from Crucial, as they're more likely to help you if there is a problem with the product. The Newegg picture, did not remove the module from the packaging, so we can't look at the back of it. But if Crucial says it works, then it works. Paul |
#7
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
"A_Michigan_User" wrote:
Paul, Maybe it would help if I understood the math instead. 128m x 64... in order to get 1gb... wouldn't it *HAVE TO BE* 16 chips? No? I thought 128m x 64 was the memory available in each chip. No? I've already bought my "wrong" memory from NewEgg... so (if they allow me to exchange it)... I'd like to buy the "correct" stuff also from NewEgg. I really hate to shop by "what the picture might look like"... but I guess I'll have to in this case. I was *SO* careful to try and buy the right stuff: 1gb (all on 1 stick, not 2) DDR2 DIMM Avoid laptop memory 533/400 Unbuffered Not dual-channel Not ECC 240-pin PC2-4200 Big name manufacturer Big name store Low price Free shipping I even made sure it was 1.8 volt Results? The wrong memory anyway. Ugh. The thing is, *you* were careful, but the manufacturers were not. They're the ones getting the "epic fail" here. I guess I didn't explain the size very well. The 128m x 64 is a "total array" size for the entire DIMM. It means the module is 128 million locations deep by 64 bits wide. 64 bits is equal to 8 bytes. 128M * 8 bytes = 1GB. In effect it says the module has a total of 1GB of storage space. Several generations of memory modules have been 64 bits wide. There isn't a choice in the matter. They're all going to be 64 bits wide. *Every* advert will have 64 for the second number. Since 1GB = 128m x 64bits, we can work out that number without ever looking at the module. Say, for example, you had a 2GB module. Without seeing any chips, I can tell you the advert will say "256m x 64". You haven't learned a damn thing, except how to divide 2GB by 64. So the "256m x 64" is as meaningful as saying "2GB". In effect, the advertisement has stated the module capacity *twice* in the same ad, by saying both "256m x 64" and "2GB". The numbers I'm interested in, are "internal" numbers. (16) 64Mx8 chips (the chip density is 512 megabits each) ( 8) 128Mx8 chips (the chip density is 1024 megabits each) In the case of the first module, they're arranged like this. This is a two rank or "2R" module. I think that is one of the terms JEDEC might use for it. Only one rank is "active" or drives the bus, at a time. There is a chip select for each rank, and that is how the motherboard gets their attention. Eight chips would be on one side of the module, and eight more on the back. +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | | | | | | | | / 8 / 8 / 8 / 8 / 8 / 8 / 8 / 8 | | | | | | | | +----------+--- data-----bus-------on----------edge------connector------------ | | | | | | | | / 8 / 8 / 8 / 8 / 8 / 8 / 8 / 8 | | | | | | | | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ The other module design (the one Kingston said they might mix up accidentally, if they had chosen to sell you a module), looks like this. This module is only half detected on your motherboard. +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | | | | | | | | / 8 / 8 / 8 / 8 / 8 / 8 / 8 / 8 | | | | | | | | +----------+--- data-----bus-------on----------edge------connector------------ Both modules have an "external dimension" of 128m x 64, but that number doesn't tell you how they're arranged internally, or the size of each chip. There are other ways I can make modules if I want. Here is another module. (Chips are available in 4, 8, 16, and even some 32 bit wide ones. Plenty of choices.) +--------+ +--------+ +--------+ +--------+ | 64mx16 | | 64mx16 | | 64mx16 | | 64mx16 | +--------+ +--------+ +--------+ +--------+ | | | | / 16 / 16 / 16 / 16 | | | | +----------+--- data-----bus-----+ | | | | / 16 / 16 / 16 / 16 | | | | +--------+ +--------+ +--------+ +--------+ | 64mx16 | | 64mx16 | | 64mx16 | | 64mx16 | +--------+ +--------+ +--------+ +--------+ Again, the advert for that module says "128m x 64". It doesn't even hint that 16 bit wide chips are being used, or any other internal detail you might want to know. So there is plenty missing from the description. The industry has had plenty of time to fix this, but they choose not to. This is even a problem for people with ten year old 440BX motherboards, buying PC133 modules. There are two ways to make 256MB SDRAM modules, and one is "half-detected". So the problem has existed for ten years, and customers are still getting the wrong memory. Paul |
#8
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
Paul,
Thanks again. Looks like I should just switch to two sticks of 1gb each. (2gb total) Crucial says this is what I need: CT2KIT12864AA667 Crucial has it for $38: http://www.crucial.com/store/partspe...2KIT12864AA667 NewEgg has it for $25: http://www.newegg.com/Product/Produc...82E16820146526 So I guess I'll get the NewEgg. (But neither company says "number of chips".... so I'm again "guessing at all this".) "Paul" wrote in message ... "A_Michigan_User" wrote: Paul, Maybe it would help if I understood the math instead. 128m x 64... in order to get 1gb... wouldn't it *HAVE TO BE* 16 chips? No? I thought 128m x 64 was the memory available in each chip. No? I've already bought my "wrong" memory from NewEgg... so (if they allow me to exchange it)... I'd like to buy the "correct" stuff also from NewEgg. I really hate to shop by "what the picture might look like"... but I guess I'll have to in this case. I was *SO* careful to try and buy the right stuff: 1gb (all on 1 stick, not 2) DDR2 DIMM Avoid laptop memory 533/400 Unbuffered Not dual-channel Not ECC 240-pin PC2-4200 Big name manufacturer Big name store Low price Free shipping I even made sure it was 1.8 volt Results? The wrong memory anyway. Ugh. The thing is, *you* were careful, but the manufacturers were not. They're the ones getting the "epic fail" here. I guess I didn't explain the size very well. The 128m x 64 is a "total array" size for the entire DIMM. It means the module is 128 million locations deep by 64 bits wide. 64 bits is equal to 8 bytes. 128M * 8 bytes = 1GB. In effect it says the module has a total of 1GB of storage space. Several generations of memory modules have been 64 bits wide. There isn't a choice in the matter. They're all going to be 64 bits wide. *Every* advert will have 64 for the second number. Since 1GB = 128m x 64bits, we can work out that number without ever looking at the module. Say, for example, you had a 2GB module. Without seeing any chips, I can tell you the advert will say "256m x 64". You haven't learned a damn thing, except how to divide 2GB by 64. So the "256m x 64" is as meaningful as saying "2GB". In effect, the advertisement has stated the module capacity *twice* in the same ad, by saying both "256m x 64" and "2GB". The numbers I'm interested in, are "internal" numbers. (16) 64Mx8 chips (the chip density is 512 megabits each) ( 8) 128Mx8 chips (the chip density is 1024 megabits each) In the case of the first module, they're arranged like this. This is a two rank or "2R" module. I think that is one of the terms JEDEC might use for it. Only one rank is "active" or drives the bus, at a time. There is a chip select for each rank, and that is how the motherboard gets their attention. Eight chips would be on one side of the module, and eight more on the back. +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | | | | | | | | / 8 / 8 / 8 / 8 / 8 / 8 / 8 / 8 | | | | | | | | +----------+--- data-----bus-------on----------edge------connector------------ | | | | | | | | / 8 / 8 / 8 / 8 / 8 / 8 / 8 / 8 | | | | | | | | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | | 64mx8 | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ The other module design (the one Kingston said they might mix up accidentally, if they had chosen to sell you a module), looks like this. This module is only half detected on your motherboard. +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | | 128mx8 | +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ +--------+ | | | | | | | | / 8 / 8 / 8 / 8 / 8 / 8 / 8 / 8 | | | | | | | | +----------+--- data-----bus-------on----------edge------connector------------ Both modules have an "external dimension" of 128m x 64, but that number doesn't tell you how they're arranged internally, or the size of each chip. There are other ways I can make modules if I want. Here is another module. (Chips are available in 4, 8, 16, and even some 32 bit wide ones. Plenty of choices.) +--------+ +--------+ +--------+ +--------+ | 64mx16 | | 64mx16 | | 64mx16 | | 64mx16 | +--------+ +--------+ +--------+ +--------+ | | | | / 16 / 16 / 16 / 16 | | | | +----------+--- data-----bus-----+ | | | | / 16 / 16 / 16 / 16 | | | | +--------+ +--------+ +--------+ +--------+ | 64mx16 | | 64mx16 | | 64mx16 | | 64mx16 | +--------+ +--------+ +--------+ +--------+ Again, the advert for that module says "128m x 64". It doesn't even hint that 16 bit wide chips are being used, or any other internal detail you might want to know. So there is plenty missing from the description. The industry has had plenty of time to fix this, but they choose not to. This is even a problem for people with ten year old 440BX motherboards, buying PC133 modules. There are two ways to make 256MB SDRAM modules, and one is "half-detected". So the problem has existed for ten years, and customers are still getting the wrong memory. Paul |
#9
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
"A_Michigan_User" wrote:
Paul, Thanks again. Looks like I should just switch to two sticks of 1gb each. (2gb total) Crucial says this is what I need: CT2KIT12864AA667 Crucial has it for $38: http://www.crucial.com/store/partspe...2KIT12864AA667 NewEgg has it for $25: http://www.newegg.com/Product/Produc...82E16820146526 So I guess I'll get the NewEgg. (But neither company says "number of chips".... so I'm again "guessing at all this".) As long as either company treats you right, if there is a problem with the product, then go with the cheaper one. Make sure you know what the Newegg return policy is - how many days you have to test it and so on. After installing the RAM, your first boot should be a copy of memtest86+. Run two passes, to prove the memory isn't total crap. http://www.memtest.org/ Keep the old memory around, just in case. If you ever have a problem, and need to verify the computer still works, you can plug in that 512MB for a test. You don't have to immediately sell it on Ebay (if you could - the demand for it might not be there). Paul |
#10
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GA-8VM800PMD-775-RH 1gb + 512mb = 1gb ????
Wow, this just gets stranger and stranger.
Now even with the "correct" memory (as suggested by crucial.com)... my 2x1gb sticks are only seen as a total of 1gb.... instead of 2gb. (My original memory worked fine. 2x512mb sticks.) Memory: CT2KIT12864AA667 (matched set of 2 sticks @ 1gb each) Motherboard: Gigabyte GA-8VM800PMD-775-RH BIOS: F6 (the very latest) OS: Windows XP Pro (with all the latest patches) What else could be causing this odd problem? Thanks. "Paul" wrote in message ... "A_Michigan_User" wrote: Paul, Thanks again. Looks like I should just switch to two sticks of 1gb each. (2gb total) Crucial says this is what I need: CT2KIT12864AA667 Crucial has it for $38: http://www.crucial.com/store/partspe...2KIT12864AA667 NewEgg has it for $25: http://www.newegg.com/Product/Produc...82E16820146526 So I guess I'll get the NewEgg. (But neither company says "number of chips".... so I'm again "guessing at all this".) As long as either company treats you right, if there is a problem with the product, then go with the cheaper one. Make sure you know what the Newegg return policy is - how many days you have to test it and so on. After installing the RAM, your first boot should be a copy of memtest86+. Run two passes, to prove the memory isn't total crap. http://www.memtest.org/ Keep the old memory around, just in case. If you ever have a problem, and need to verify the computer still works, you can plug in that 512MB for a test. You don't have to immediately sell it on Ebay (if you could - the demand for it might not be there). Paul |
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