Corsair XMS3 1600MHz 2x 4GB - Failing prime with XMP profile

Craig321

Craig321

Craig321

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Joined
2 May 2004
Posts
19,950
PC:
Asus P8P67 Pro
Corsair 2x 4GB 9-9-9-24, 1.65v, 1600MHz XMS3
i7 2600K @ stock currently
Corsair HX 650W

Bit of a strange one, not sure if I'm missing something, or maybe something isn't getting enough volts.

After trying a few different things I decided to reset my BIOS, then set the RAM to use the XMP profile so it's running at full speed. But, after anything from 15 minutes to over an hour Prime will randomly fail on one or two random CPU with a rounding error.

I have tried manually setting the values as well, but no luck.

I have noticed a lot of retailed list this RAM at 9-9-9-27? Is that correct? According to Corsair it's 9-9-9-24.

Thanks.
 
Craig321 said:
PC:
Asus P8P67 Pro
Corsair 2x 4GB 9-9-9-24, 1.65v, 1600MHz XMS3
i7 2600K @ stock currently
Corsair HX 650W

Bit of a strange one, not sure if I'm missing something, or maybe something isn't getting enough volts.

After trying a few different things I decided to reset my BIOS, then set the RAM to use the XMP profile so it's running at full speed. But, after anything from 15 minutes to over an hour Prime will randomly fail on one or two random CPU with a rounding error.

I have tried manually setting the values as well, but no luck.

I have noticed a lot of retailed list this RAM at 9-9-9-27? Is that correct? According to Corsair it's 9-9-9-24.

Thanks.
Click to expand...

You might want to try lowering your voltage to 1.5V or thereabouts, and also loosening the timings a bit. I have finally managed to get my Kingston Hyper-X running stably using the XMS profile, at 9-9-9-27, 1600 - but only by running it at 1.5V.

See if it passes memtest86+, that way you will get a better idea whether it's the RAM or CPU (or something else) that's causing the instability.
 
Nice, 1.50v seems to have done the trick! Strange!

2 hours prime stable at the moment, it usually fails before that with 1.65v on there. Will be running it a bit longer later (when I don't want to play Trackmania :p).

Thanks for the advice :)

Wonder if it'll work at these settings or not tomorrow when I get my 2 new sticks of RAM int here.
 
I have the same RAM and was wondering if you have yours running at the full 1600mhz Craig321? I think my voltage is at 1.65v so would this somehow prevent it from reaching that speed (currently at 1333mhz even though manually set to 1600 in BIOS :\)

Thanks
 
Rock solid now at 1.5v 9-9-9-24 1600MHz (basically the XMP profile, but with 1.50v). I have 4 sticks in now as well.

When it was at 1.65v it was failing prime at around 15 mins - 1 hour and sometimes even resetting the PC completely.

Only strange thing now is speedstep isn't working anymore. If I turn the XMP profile off speedstep starts working again :confused:
 
Last edited:
Thanks,

Mine's currently running on XMP profile which puts it at 9-9-9-27 at 1.65v.
I'm not too familiar with timings and voltages, but is it basically a case of lowering the timing down or whatever by 1 until it's stable or is there a particular method to follow?

More importantly - will I gain much from doing this, is there point, or what benefits will I see, if any?

Thanks :)
 
If you have the same RAM as me then I'd start at 1.50v, 9-9-9-24, 1600MHz. Run Prime for a few hours and see how it does. If it fails for some reason then change the timings to 9-9-9-27.

You'll want to double check what the timings are supposed to be. My XMP profile is 9-9-9-24, so yours should be the same if it's identical RAM

This is the exact model number: Corsair CMX8GX3M2A1600C9

You're not going to see a difference going from 9-9-9-27 to 9-9-9-24. Also, I seem to remember reading something somewhere about how timings don't matter nearly as much anymore with newer systems.

If you did want to lower your timings then yes, the correct way would be to lower them a little bit at a time, running tests after every change.
 
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