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DDR3 Memory for Core i7 920 / ASUS P6T


Doug.B

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Can anyone offer some advice on DDR3 memory for my new Core i7 920 build? I'm not sure if I should go with DDR3 1600, 1333, or maybe even 1066. If I understand correctly, the 920 natively supports 1066 memory. My question is would I benefit from the higher bandwidth of the 1600? I read one article that seemed to indicate the higher bandwidth would not be as beneficial as the lower latencies of either DDR3 1333 or 1066.

 

I'm looking to run 6 GB of triple channel on an ASUS P6T Deluxe motherboard. I have been looking at 2 triple channel kits at the moment:

 

1) DDR3 1600 - 6 GB (3 x 2 GB) PC3 12800 with 8-8-8-24 Timings at 1.65V

 

2) DDR3 1333 - 6 GB (3 x 2 GB) PC3 10666 with 7-7-7-20 Timings at 1.65V

 

I don't want to limit myself by buying the wrong SDRAM and there doesn't seem to be very much out there yet as far as DDR3 benchmarks on the new Nahalem chips. I'm curious if the DDR3 1333 would actually perform better with the lower CAS Latency. Also, can you set the DDR 1600 to run at 1333 or 1066 with lower latencies?

 

Thanks in advance for any help...

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Consider this a bump... I am interested in a reply to this too.

 

Corsairs suggested timings for TR3X6G1333C9 are 9-9-9-24-2T and while I know VERY little about such things I have read that lower numbers are better and these seem really high.

 

This blurb from the Asus manual might make the use of 1600 a bad idea because if I am reading it right this would limit you to 6gig instead of 12gig:

 

Due to Intel spec definition, XPM DIMMs and DDR-3 1600 are supported for one DIMM per channel only.

 

This blurb from the Asus manual also worries me:

 

According to Intel CPU spec, DIMMs with woltage reqirement over 1.65v may damage the CPU permanently. We reccommend that you install the DIMMS with the voltage requirement below 1.65v.

 

I know it says voltages over 1.65v may damage the CPU but it also states install ram with a voltage requirement below 1.65v. Can anyone shed some light on this?

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You can run 1.65v memory on it just fine. 1.65v isn't a hard number that you can never pass, however you need to keep the memory voltage within 0.5v of the QPI voltage setting, which is at 1.15v by default I believe.

 

Read these threads:

http://www.xtremesystems.org/forums/showthread.php?t=209452

http://www.xtremesystems.org/forums/showthread.php?t=207972

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