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#1
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is 222 1t timing much better than 333 2t
Hi:
Does anybody know if there are any manufacturer that makes 1GB DDR266 cas2 2-2-2 timing. I am putting together a dual xeon system that has room for four memory modules and i want to put 4GB of memory. I know you can have 512MB modules that are cas2 with 2-2-2 T1 timing, but i need more memory than just 2GB. I would really appreciate any help. thank you if you could email me i really appreciate it: |
#2
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Thank you very much for you information. I got a iwill dp533 MB that takes
unbuffered or registered memory. Everything else is exteremly fast about the system I just wanted the memory to be fast too. No, I really don't know if it would be stable or not but going to 2.5-3-3 is kind of too slow, maybe 2.5-2-2 if i can get some of those in 1GB DDR266 pc2100 modules. again, thank you for your help. "kony" wrote in message ... On Sun, 27 Jul 2003 22:31:25 GMT, "ali yousefi" wrote: Hi: Does anybody know if there are any manufacturer that makes 1GB DDR266 cas2 2-2-2 timing. I am putting together a dual xeon system that has room for four memory modules and i want to put 4GB of memory. I know you can have 512MB modules that are cas2 with 2-2-2 T1 timing, but i need more memory than just 2GB. I would really appreciate any help. thank you if you could email me i really appreciate it: Have you even confirmed that 4 1GB modules will run at 2-2-2 T1 on that board? I would bet they won't, that at least you would have to manually set the timings lower (if the motherboard doesn't do so automatically), maybe to 2.5,3,3 just to have stability with THOSE modules, but lower-spec modules may not work at all. Generally registered memory is used in these situations, that's what I would buy. Dave |
#3
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On Mon, 28 Jul 2003 03:19:01 GMT, "ali yousefi"
wrote: "kony" wrote in message blah blah blah: Have you even confirmed that 4 1GB modules will run at 2-2-2 T1 on that board? I would bet they won't, that at least you would have to manually set the timings lower (if the motherboard doesn't do so automatically), maybe to 2.5,3,3 just to have stability with THOSE modules, but lower-spec modules may not work at all. Generally registered memory is used in these situations, that's what I would buy. Dave Thank you very much for you information. I got a iwill dp533 MB that takes unbuffered or registered memory. Everything else is exteremly fast about the system I just wanted the memory to be fast too. No, I really don't know if it would be stable or not but going to 2.5-3-3 is kind of too slow, maybe 2.5-2-2 if i can get some of those in 1GB DDR266 pc2100 modules. It would seem you have a choice to make... a lot of memory, or less but faster memory. Also consider that even though your motherboard would run PC2100 memory by specification, you might have better results attaining better timings by buying memory with higher specification than actually needed, like PC2700 2-2-2 or PC3200 2-2-2, though of course with the amount of memory you want the extra expense could be significant. If it were me I'd still buy registered memory instead, if using more than 2 - 1GB modules. I suppose you can always buy from some place with a good return policy, or speak to the retailer in person to get their specific recommendation. On the other hand, Iwill does provide this memory compatability guide: http://www.iwillusa.com/supports/Com...?vID=91&PID=36 Upon Checking http://www.crucial.com , they show several motherboards using the same i7505 chipset (including yours) are using this same CL2.5 Module (but again I don't know if you can use 4 of them together): http://www.crucial.com/store/PartSpe...4Z265S&cat=RAM If you're forced to raise the memory timings with 4 modules, you might first try raising the "Precharge" to a higher value. There really isn't that great of a performance drop by using 2.5,2,2, memory instead of 2,2,2, but of course you are building a high-end system so I can understand wanting to get the utmost bandwidth, but it might be easier to retain stability and have good performance by rasing the memory bus MHz speed instead of lower CAS timing. Of course extensive testing should be done with memtest86: http://www.memtest86.com Dave |
#4
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Thank you so very much kony, your information were exteremly informative.
I am now looking at 2.5-2-2 or 2-3-3 in mushkin, infineon or micron. I just have one question there sometimes is a 4th digit in the timing that is advertised, for example 2.5-3-3-7 what is the last digit(here 7) suppose to represent. again thank you very much for your help. by the way have you come across anywhere on the net that is selling 1GB DDR266 or higher with 2.5-2-2 timing? thank you "kony" wrote in message ... On Mon, 28 Jul 2003 03:19:01 GMT, "ali yousefi" wrote: "kony" wrote in message blah blah blah: Have you even confirmed that 4 1GB modules will run at 2-2-2 T1 on that board? I would bet they won't, that at least you would have to manually set the timings lower (if the motherboard doesn't do so automatically), maybe to 2.5,3,3 just to have stability with THOSE modules, but lower-spec modules may not work at all. Generally registered memory is used in these situations, that's what I would buy. Dave Thank you very much for you information. I got a iwill dp533 MB that takes unbuffered or registered memory. Everything else is exteremly fast about the system I just wanted the memory to be fast too. No, I really don't know if it would be stable or not but going to 2.5-3-3 is kind of too slow, maybe 2.5-2-2 if i can get some of those in 1GB DDR266 pc2100 modules. It would seem you have a choice to make... a lot of memory, or less but faster memory. Also consider that even though your motherboard would run PC2100 memory by specification, you might have better results attaining better timings by buying memory with higher specification than actually needed, like PC2700 2-2-2 or PC3200 2-2-2, though of course with the amount of memory you want the extra expense could be significant. If it were me I'd still buy registered memory instead, if using more than 2 - 1GB modules. I suppose you can always buy from some place with a good return policy, or speak to the retailer in person to get their specific recommendation. On the other hand, Iwill does provide this memory compatability guide: http://www.iwillusa.com/supports/Com...?vID=91&PID=36 Upon Checking http://www.crucial.com , they show several motherboards using the same i7505 chipset (including yours) are using this same CL2.5 Module (but again I don't know if you can use 4 of them together): http://www.crucial.com/store/PartSpe...4Z265S&cat=RAM If you're forced to raise the memory timings with 4 modules, you might first try raising the "Precharge" to a higher value. There really isn't that great of a performance drop by using 2.5,2,2, memory instead of 2,2,2, but of course you are building a high-end system so I can understand wanting to get the utmost bandwidth, but it might be easier to retain stability and have good performance by rasing the memory bus MHz speed instead of lower CAS timing. Of course extensive testing should be done with memtest86: http://www.memtest86.com Dave |
#5
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On Mon, 28 Jul 2003 06:00:14 GMT, "ali yousefi"
wrote: Thank you so very much kony, your information were exteremly informative. I am now looking at 2.5-2-2 or 2-3-3 in mushkin, infineon or micron. I just have one question there sometimes is a 4th digit in the timing that is advertised, for example 2.5-3-3-7 what is the last digit(here 7) suppose to represent. again thank you very much for your help. The last digit is tRAS, lower is better, but the difference isn't as significant as CAS or CMD. by the way have you come across anywhere on the net that is selling 1GB DDR266 or higher with 2.5-2-2 timing? Unfortunately no, or not that I'm aware of... many vendors mention only the CAS rating, nothing more. Dave |
#6
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"kony" wrote in message
... On Sun, 27 Jul 2003 22:31:25 GMT, "ali yousefi" wrote: Does anybody know if there are any manufacturer that makes 1GB DDR266 cas2 2-2-2 timing. I am putting together a dual xeon system that has room for four memory modules and i want to put 4GB of memory. Have you even confirmed that 4 1GB modules will run at 2-2-2 T1 on that board? I would bet they won't, that at least you would have to manually set the timings lower (if the motherboard doesn't do so automatically), maybe to 2.5,3,3 just to have stability with THOSE modules, but lower-spec modules may not work at all. Generally registered memory is used in these situations, that's what I would buy. Are you both aware that most versions of Windows cannot allocate more than 2GB of RAM to applications? All the RAM above 2GB can only be used by Windows for itself. So in most situations the extra RAM is wasted. Only Win2k and Win2003 Advanced Servers can allocate 3GB to applications but even there some restrictions apply. |
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