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Stability testing: Are gigaflops important?

post #1 of 5
Thread Starter 
Hey guys,

Firstly, my question: Should I care about GFlops or just being Linx/p95 stable at the highest speed I can get when stability testing? I really don't know the significance of that statistic.

I've been trying to push my i7 a bit past the tame 3.77Ghz OC I've got right now and I do Linx for a few runs after making changes (mostly to check temps quickly because I'm heat limited). I've noticed something, when I start increasing BCLK I start to get lower GFlops untill I get to a point where I error or BSOD because of too low VTT. At that point I bump it up one notch and get high(er) GFlops again and runs take less time to complete, with that though come higher temps and sometimes I have to back off.

This is pretty annoying, I went back to the settings I normally run for 3.77GHz (I've passed 50 runs of Linx with these) and checked GFlops, they are not very low but not exactly the highest I've seen at other settings. Lowering BCLK gets me higher GFlops, I don't know if I should leave the speed a bit lower now.

EDIT: Oh and I'm usually running my ram underclocked some (rated 1333Mhz, I run ~1132) but at default timings, I've been able to get higher CPU speed with loose timings (10-10-10-24) but I don't know if that is better than lower CPU speed and timings at 9-9-9. I'm a bit confused about the ram side of OC'ing, I just know default settings heat up my cpu a lot.
Edited by jid - 2/14/11 at 1:35pm
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Cheech
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post #2 of 5
It's not important in terms of actual real-usage performance if that's what youre asking, but you should see a gain of GFlops the higher the OC is. Remember though, HT ****s up the GFlops so don't try comparing it to a non-HT Processor @ the same clock as yours. Also, make sure your GFlops are relatively stable (Ex: 47.555, 47.328, 47.656, 48.051, 47.955) and not too far (Ex: 47.555, 45.545, 49.343) and you should be around the ~45 GFlops area minimum with an OCed i7
post #3 of 5
If you have to back off from your overclock due HEAT, then you shouldn`t worry about gflops (i know, they are lovely) but get a nice CPU cooler.
A wicked idea would be if you go in user CP and fill out what system you got, this would help! Good LUCK!
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post #4 of 5
If you are running linpack to stress test you want the gigaflops to be relatively stable and not be more than 1 gigaflop between the highest and lowest value. If it fluctuates a lot it is likely not entirely stable even if it doesn't bsod or crash.
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post #5 of 5
Thread Starter 
Ok I get it now, thanks guys.

As for the heat trouble it's just my chip, I tested it at stock and got almost identical temp readings to others at load. I've read a few times it's ok to make 80C your limit while stress testing if you use HT, but whenever I go above 73C for more than a few seconds (not sure how long) Realtemp shows the multi dropping down to x9.0 for a short while and temps drop too before the chip ramps up to full speed again, it never does that when the temps stay at or below 73C. So I just aim to stay under 73
Cheech
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Cheech
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