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passing memtest doesn't mean stable?

post #1 of 8
Thread Starter 
So I haven't used memtest in the past, but this time I was playing around with my memory and thought I shoudl give it a go. I was running 3 1600 CL7 sticks, and was able to pass memtest+ at 1950-7-7-7-21-1T, however I can't boot unless I reduce the frequency to somewhere between 1780 and 1866 (I haven't figured out the exact limit yet).
FWIW I put my cpu back to stock, so it's not my cpu overclock.

Is this expected? I thought memtest was supposed to be the "be all and end all" of memory stability.
Edited by stren - 5/3/11 at 9:51am
     
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post #2 of 8
You will also need to make sure your IMC can handle the memory speed too. I can pass memtest at 2000MHz but it will blue screen if i try to boot into windows.
post #3 of 8
Thread Starter 
So how does memtest manage to check the memory without using the IMC?
     
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post #4 of 8
Thread Starter 
So let me ask - given that I know my cpu limits, what's the best tool to quickly/accurately test for memory stability that also tests the IMC properly?
     
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post #5 of 8
You shouldn't need to fiddle the memory anymore, just increase your QPI/DRAM voltage (or called CPU VTT) if you aren't stable. LinX is probably the fastest way to determine stability (20 passes on all available memory), and prime95 blend test is also good but slower (10 hours slow on the default 15 minute interval).
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post #6 of 8
Thread Starter 
Sounds good, guess I'll go do that then thanks, Even with QPI of 1.5V I wsn't booting, how high can you push QPI under water?
     
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post #7 of 8
Intel says the max is 1.35 i would not go over 1.55 but that is just me. Personally I don't want to run anything more than 1.35. If you drop your memory down to ~1600 it should drop the required QPI voltage by a lot, like down into the 1.35 range.
post #8 of 8
Thread Starter 
Quote:
Originally Posted by rancor View Post
Intel says the max is 1.35 i would not go over 1.55 but that is just me. Personally I don't want to run anything more than 1.35. If you drop your memory down to ~1600 it should drop the required QPI voltage by a lot, like down into the 1.35 range.
Yeah I don't seem to get much benefit beyond 1.4V and I'm a little scared of pushing beyond 1.5, guess I'll play with my timings some instead.
     
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