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Thread: What kind of core temps would be "safe" for 24/7 folding on an i7-950?

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    Default What kind of core temps would be "safe" for 24/7 folding on an i7-950?

    I've had my system folding 24/7 at 4.3 Ghz for a couple of months.
    My CPU and GPU are both in the same water cooling loop, and both are folding.
    I'm happy with my core temperatures, they run in the 62-63C range in 25C ambient when I'm home, and top out around 70 for a few hours when the ambient temperature gets up to 31C in my house while I'm at work.

    I'm looking to push my overclock up a little higher, but I seem to have hit a bit of a wall with my CPU.

    It is absolutely iron clad stable running at 4.3 Ghz @1.35 vcore under extended max stress tests, and 24/7 folding, but to even get to 4.4 Ghz, it needs a good size bump in vcore.

    I'm just not sure exactly what range of core temperatures I should be concerned about for continuous 100% CPU use folding 24/7.

    Same questions for voltages. What would be the rough limits for core, PLL and QPI voltages for 24/7 load?
    I'm not sure how to tell really, but I've wondered if I'm also running into some stability issues at >4.3 Ghz due to high northbridge temperatures. My board doesn't actually report the NB temp, but the heatsink gets pretty dang hot.

    I'm not to worried about the CPU lasting >5 years, but I don't want to fry it in a few months either. If I can get 2 or 3 years out of it, I'd be happy.
    Chances are the CPU and motherboard will become the core of a dedicated Linux folding rig if I upgrade next year anyway.

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    Well, it seems to be stable at 4.37 Ghz(HT on) with the vcore set at 1.3625v and QPI at 1.3375v.
    It made it through 50 passes of LinX set on 25k problem size, I'll see how it does folding.

    To get just a touch higher to 4.4 Ghz, it seems to want the vcore set >1.4v, so 4.37 may be as high as I can go for folding.

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    Different folk have different views about what is safe in terms of both voltage and temps
    I am happy to run at 1.45v on my i7 950 but the main reason I find that acceptable is that I can run at 40 deg over ambient so just now that means I am at 54 deg.
    I know people that fold and or crunch at temps of 85 deg and have done so for many months so I would say you will be fine for now and could even push higher but from an efficiency point of view it sounds like you are on the knuckle of the curve.
    By that I mean if you were to plot the voltage needed to hit a certain frequency the curve would be somewhat exponential and just now you seem to be at the point where the curve goes more vertical so any higher will present a lot more cost for little gain in performance
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    Default

    1.45v will degredate the chip. My chip does not overclock as well as new and I have run voltages from 1.375 to 1.42. To be safe keep the voltages within Intel limit of 1.375v imo.

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