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XM2S 1066 ram won't post at 1066mhz


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I recently built my new system, including GA-965P-DS3 (rev 3.3) motherboard and Corsair XM2S-8500 memory, but I've never been able to get the machine to POST with memory set to 1066 mhz. If I set memory to 800 or 888mhz it's fine though. I'm running the timings at 5-5-5-15, as recommended.


Memory is running in dual channel mode.


I have checked the FAQ's and done a search of the forums but can't think what else to try, apart from maybe running it in single channel?


Mobo has latest BIOS too.


edit: Full system specs are:


Windows Vista Ultimate Edition

Gigabyte GA 965P DS3 rev 3.3

Core2 Duo E6300

XTX GeForce 8800 GTS XT (550/1700MHz)

2 x 1Gb Corsair 1066MHz

Samsung 160Gb SATA 7200rpm HD

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That is about normal for this chipset, it will top out about 900-1030 MHz at the extreme with the right over clock able CPU. And did you set the memory Voltage to 2.2 Volts?
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thanks, I'm not so worried if that's pretty normal, I just thought I was missing something.


I tried try upping the vdimm by +0.3v , but the sticks were getting quite toasty, so I'll just keep running it at 888mhz and stock voltage.

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