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spd/xmp question

post #1 of 5
Thread Starter 
Why is it that my xmp for 1600 mhz is way different than what I set my timings to? Actually my system wont even POST when I set the profile in bios 8-7-8-20 2T
but it runs great when I set it to 7-8-7-19 1T

    
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post #2 of 5
when you set XMP in the BIOS, the SPD timings are read from the memory sticks (actually, the one in slot 1) and those are used.

The XMP SPD timings include many more settings than just the first 5 you mention.
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post #3 of 5
CPU-Z is known to misread XMP profiles very frequently, are you sure that loading the XMP actually sets the memory to 8-7-8 (which it can't POST)?
If yes, then it looks just like an awkward typo by Corsair and manual settings should work alright.
post #4 of 5
Thread Starter 
Quote:
Originally Posted by Sam OCX View Post

CPU-Z is known to misread XMP profiles very frequently, are you sure that loading the XMP actually sets the memory to 8-7-8 (which it can't POST)?
If yes, then it looks just like an awkward typo by Corsair and manual settings should work alright.

yes. in my bios there is a setting for D.O.C.P.(dram oc profile). It has setting for 1600, 1800, 1866, 2000, and xmp 8-7-8-20 2T. All of which have their own FSB settings. I have loaded the XMP profile and played w/ the numbers. Set 2T to 1T, but it won't boot until I set the timing to 8-8-8-20, that it'll even post. After a reboot the bios will show the 8-7-8 timings have been loaded.

A typo could be right. At 1800mhz up to 1866mhz I can use 8-9-8 20 but higher than that?
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

when you set XMP in the BIOS, the SPD timings are read from the memory sticks (actually, the one in slot 1) and those are used.

The XMP SPD timings include many more settings than just the first 5 you mention.

Yes but those are the ones that pertain to the overall stability and performance are they not?
    
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