Well, I've been overclocking for 12 years now and I can only speak from my experience but Prime (in any form) is not always an indicator of stability. On my old AMD system with a 5000+ BE I could Prime all day long at 3.2GHz, but I know for a fact that it was not 100% stable, for example. That's why I am not longer a big speaker for Prime (or for that matter any one stress tool). You will also notice huge differences when running Prime 32-bit and Prime 64-bit, so what then? Do you say that unless you are full-day stable in both Primes under all three options for running it you are not absolutely stable? Or better yet, blend tests say they test RAM, but I am certain that they do not test 6GB of ram, so what then?
Anyway, I think you get my point. I ran Prime for about 2 hours, temps were stable, everything was stable. For me that is good enough. Indeed, in most cases I will not run Prime for more than 30 minutes before I declare an OC stable. This has never failed me in the past and I doubt it will be any different now. I will also almost bet you that if you leave Prime running just long enough with a hefty OC, your system will crash. How long that "just long enough" may be is subjective and dependent on your OC. It may be hours, may be days, maybe a week.
Now, I am running my ram at 1603MHz, 7-8-7-20-1T timings, 1.35000V QPI/DRAM, 1.65681V DRAM.
I have so far gone through tree different i7 940s. The first clocked better at lower volts than the second but it was a hot chip, so it maxed out at 4GHz. Second was just bad as it was never fully stable at 4GHz even if you up the voltages to 1.46V (as high as I would go on air). Finally, this third chip now is a bit hotter than #2, but better than #1 and #2 in both volts and clocks.
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