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#1
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Upgrading memory in GA 8KNXP rev2. Which sockets?
At the moment I have two 512MB modules in slots 1 and 4. I want to upgrade
to a total of 3GB by using two additional 1GB modules to make a total of four modules. The Users manual says "If four DDR memory modules are installed, (two pairs of DDR memory modules with the same memory size and type): The Dual Channel Technology will operate when a pair of DDR memory modules are inserted into DIMM 1, 4 and another pair into DIMM 2, 5." Do the two pairs have to be the same or can one pair be 512MB (in slots 1, 4) and the other pair be 1GB (in slots 2,4) or do all four modules have to be identical? Cheers, Brian |
#2
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Upgrading memory in GA 8KNXP rev2. Which sockets?
Brian Griffin wrote:
At the moment I have two 512MB modules in slots 1 and 4. I want to upgrade to a total of 3GB by using two additional 1GB modules to make a total of four modules. The Users manual says "If four DDR memory modules are installed, (two pairs of DDR memory modules with the same memory size and type): The Dual Channel Technology will operate when a pair of DDR memory modules are inserted into DIMM 1, 4 and another pair into DIMM 2, 5." Do the two pairs have to be the same or can one pair be 512MB (in slots 1, 4) and the other pair be 1GB (in slots 2,4) or do all four modules have to be identical? Cheers, Brian For dual channel, you want the same memory dimensions for the modules that are paired. The pairs can be different than one another, so your 2x512MB + 2x1GB configuration should be OK, using them as you describe. 875 memory guide (See Figure 5 & Figure 6 on Page 11) ftp://download.intel.com/design/chip...s/25273001.pdf The configuration you'll be using, is called "Normal Mode" in the guide. I wouldn't expect a big difference in performance between Normal Mode and Dynamic Mode. (Page 13 has a table, which ranks the different modes, but the table lacks numbers to show how significant the effects are.) To test, you can try a benchmark with just the pair of 1GB installed, and then rerun the benchmark with all four installed. On my 875 machine, using memtest86+ bandwidth indicator, I didn't get any difference in measured bandwidth, but that isn't really unexpected, due to the sequential access pattern. It is really hard to say, exactly what program would gain a big advantage from any of these modes that rely on interleave patterns or "open" pages. For a benchmark, I recommend SuperPI as a simple, single threaded test. You pick a number of digits, which results in the memory footprint not fitting entirely in cache. Since a P4 has a relatively small cache, you can use 1 million digits of PI calculation as your test. 1 million digits seems to use 8MB of RAM (the P4 cache is smaller than that). Larger numbers of digits take longer to calculate, and for some of the processors with larger cache, or faster execution times, people use the 32 million digit test. This bench was written a long time ago. The source is no longer available (a guy in Japan wrote it). Improvements to the program have been made over the years, by adding extra bytes with a hex editor. So if the program seems a little antique looking, there is a reason for that. http://www.xtremesystems.com/pi (I cannot reach here right now) http://www.techpowerup.com/downloads/366/ On my P4 and AthlonXP 3200+ systems, this benchmark takes 45-50 seconds to complete, for 1 million digits. The 50 second number was on the machine that was running AV in the background. The P4 was running at 3.1GHz. So that is the ballpark range I'd expect to see. You may be wondering, why the Intel document only refers to four slots, when your board has six. Your board is an anomaly, in the sense that Gigabyte has chosen to fool you into thinking it can use a lot of RAM. They used a trick which was used back in the single channel days. They add an extra slot to a channel, then cross-wire the ranks. The chipset can control four ranks (sides) of memory per channel (which I show below as A,B,C,D). The three DIMMs per channel on your board, is a total of six sides. This is the wiring pattern. Six physical sides, but only four controls for them. Slot 1 A B Slot 2 C D Slot 3 D C If you wanted to put RAM in both slot 2 and slot 3, the RAM could only be single sided. (Thus C gets used in slot 2, and D gets used in slot 3.) If you put a double sided stick in slot 2, that uses both C and D, and then nothing can go into slot 3. HTH, Paul |
#3
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Upgrading memory in GA 8KNXP rev2. Which sockets?
Sorry but I've just noticed a slight error in my question. the last line
should have read ". . . the other pair be 1GB (in slots 2, 5) [not 2, 4] or do . . .". Apologies to all. "Brian Griffin" wrote in message ... At the moment I have two 512MB modules in slots 1 and 4. I want to upgrade to a total of 3GB by using two additional 1GB modules to make a total of four modules. The Users manual says "If four DDR memory modules are installed, (two pairs of DDR memory modules with the same memory size and type): The Dual Channel Technology will operate when a pair of DDR memory modules are inserted into DIMM 1, 4 and another pair into DIMM 2, 5." Do the two pairs have to be the same or can one pair be 512MB (in slots 1, 4) and the other pair be 1GB (in slots 2,4) or do all four modules have to be identical? Cheers, Brian |
#4
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Upgrading memory in GA 8KNXP rev2. Which sockets?
Thanks, I can see what you say about running in normal mode but hopefully it
won@t be a problem. The memory is on order. Cheers, Brian "Paul" wrote in message ... Brian Griffin wrote: At the moment I have two 512MB modules in slots 1 and 4. I want to upgrade to a total of 3GB by using two additional 1GB modules to make a total of four modules. The Users manual says "If four DDR memory modules are installed, (two pairs of DDR memory modules with the same memory size and type): The Dual Channel Technology will operate when a pair of DDR memory modules are inserted into DIMM 1, 4 and another pair into DIMM 2, 5." Do the two pairs have to be the same or can one pair be 512MB (in slots 1, 4) and the other pair be 1GB (in slots 2,4) or do all four modules have to be identical? Cheers, Brian For dual channel, you want the same memory dimensions for the modules that are paired. The pairs can be different than one another, so your 2x512MB + 2x1GB configuration should be OK, using them as you describe. 875 memory guide (See Figure 5 & Figure 6 on Page 11) ftp://download.intel.com/design/chip...s/25273001.pdf The configuration you'll be using, is called "Normal Mode" in the guide. I wouldn't expect a big difference in performance between Normal Mode and Dynamic Mode. (Page 13 has a table, which ranks the different modes, but the table lacks numbers to show how significant the effects are.) To test, you can try a benchmark with just the pair of 1GB installed, and then rerun the benchmark with all four installed. On my 875 machine, using memtest86+ bandwidth indicator, I didn't get any difference in measured bandwidth, but that isn't really unexpected, due to the sequential access pattern. It is really hard to say, exactly what program would gain a big advantage from any of these modes that rely on interleave patterns or "open" pages. For a benchmark, I recommend SuperPI as a simple, single threaded test. You pick a number of digits, which results in the memory footprint not fitting entirely in cache. Since a P4 has a relatively small cache, you can use 1 million digits of PI calculation as your test. 1 million digits seems to use 8MB of RAM (the P4 cache is smaller than that). Larger numbers of digits take longer to calculate, and for some of the processors with larger cache, or faster execution times, people use the 32 million digit test. This bench was written a long time ago. The source is no longer available (a guy in Japan wrote it). Improvements to the program have been made over the years, by adding extra bytes with a hex editor. So if the program seems a little antique looking, there is a reason for that. http://www.xtremesystems.com/pi (I cannot reach here right now) http://www.techpowerup.com/downloads/366/ On my P4 and AthlonXP 3200+ systems, this benchmark takes 45-50 seconds to complete, for 1 million digits. The 50 second number was on the machine that was running AV in the background. The P4 was running at 3.1GHz. So that is the ballpark range I'd expect to see. You may be wondering, why the Intel document only refers to four slots, when your board has six. Your board is an anomaly, in the sense that Gigabyte has chosen to fool you into thinking it can use a lot of RAM. They used a trick which was used back in the single channel days. They add an extra slot to a channel, then cross-wire the ranks. The chipset can control four ranks (sides) of memory per channel (which I show below as A,B,C,D). The three DIMMs per channel on your board, is a total of six sides. This is the wiring pattern. Six physical sides, but only four controls for them. Slot 1 A B Slot 2 C D Slot 3 D C If you wanted to put RAM in both slot 2 and slot 3, the RAM could only be single sided. (Thus C gets used in slot 2, and D gets used in slot 3.) If you put a double sided stick in slot 2, that uses both C and D, and then nothing can go into slot 3. HTH, Paul |
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