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Thread: Prime95

  1. #1
    Joined
    Aug 2014
    Location
    NJ
    Posts
    156

    Prime95

    I just used this on my 4790K, just to try it out. It hit 100c in a matter of 3-4 minutes! Shuy it off immediatly!
    Used to use this with my 3570K with a 129AIO never got that high
    Does it not play well with Haswell.

    I never hit over 64c while gaming and other vairous programs running at once.

  2. #2
    Joined
    Sep 2002
    Location
    The Netherlands
    Posts
    4,169

    Re: Prime95

    Even my delidded 4970k will hit 100c (or come really close) when running 4.4ghz on all cores using prime95 in blend mode.
    But like u said it's not very representative of stress during gaming.
    I've been using the 'Large FTTs' mode lately. Max temp are closer to the temps of some high CPU load games. So far it seems like if i can run that Prime95 mode for a couple of hours i have to problems in any of my games either.
    Overclocking system:
    ASUS Rampage Formula (BIOS 0403)
    Xeon x3350 SLAX2 @ 8x475=3.8Ghz 1.29Vcore
    Dual Radiator (modded) Koolance EXOS with Zalman WB5 CPU block
    2 x 2GB OCZ Platinum PC8000 @ 950Mhz 5-5-5-18 1.8v
    Enermax NoiseTaker 600W
    ASUS GeForce 8800GTX @ 645/1645/1000

  3. #3
    Joined
    Aug 2014
    Location
    NJ
    Posts
    156

    Re: Prime95

    Thanks for the reply and info, im gonna try it out with the "Large FTT's" mode. Im using a Corsair H105 so it should have decent temps.

  4. #4
    Joined
    Aug 2000
    Location
    Vvardenfell
    Age
    58
    Posts
    10,951

    Re: Prime95

    It's mainly the AVX instructions. Older CPUs couldn't do them, but your CPU can and then it will get about 10-20oC hotter than normal. To check, watch in blend. If the temps stay normal for about two minutes, then rocket up, it's AVX. There's a hack to disable them in Prime95, or you can use BIOS to turn down the multiplier when executing AVX instructions if your BIOS has that function. It's possible that Large FTTs doesn't use them, but I'm not sure.

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