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  1. #1

    Question about small fft vs large in prime95

    If I have a setting that can run small fft without errors for hours (I got up to 5 hours before turning it off) but it gets an error in about 30 minutes of large fft ... is this an indication that the problem is more likely something with the MCH settings? Or could it be the extra heat large fft is causing? I'm not sure how the tests differ, but from what I understand, large fft stresses fsb more in quads? The setting is 510 x 7.
    - How to pad-mod/VID-mod your cpu

    Currently waiting for lga2011 to upgrade to new system

    CPU: Intel E8500
    Motherboard: GIGABYTE GA-EP45-UD3P
    RAM: 4gb Corsair Dominator DDR2 1066 w/ RAM cooling fan
    Cooling: CPU/GPU/NB = Water Cooled
    Graphics: EVGA GeForce GTX 260 core 216 (@ 771/1566/1298)
    PSU: Corsair tx 650w

  2. #2
    Member Kris's Avatar
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    Eating thermal paste!@#
    As I understand it and I may be wrong. You may be looking at ram and or NB needing some more tweaking. Blend will test more ram and NB stability than small ftt. Not knowing your current settings I don't want to give advice on what changes to make.
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  3. #3
    I never use large ftt not sure of what value it has, try using blend if that fails run memtest if memtest passes than you most likely just need to boost your nb voltage.
    CPU: Qx9650 C1 @ 4ghz daily
    Mobo: Gigabyte EP45-UD3P
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  4. #4
    as far as I know, large ffts are too big for the cache so they get sent to the ram, this could mean your NB/Ram needs some more love and work lol
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  5. #5
    Member Dapman02's Avatar
    Join Date
    Jan 2008
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    Overland Park, KS
    Small fft=CPU
    Large fft=RAM
    Blend= Ram and/or Northbridge.
    try loosining your timing and see if that helps, also you should increase your ram voltage.

    If blend fails increase your northbridge voltage, also make sure you actively cool and upgrade your northbridge heatsink.
    Desktop: Return of Deneb
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    GPU: Visiontek 5850 Core 875Mhz/1175mhz memory
    Motherboard: MSI 880G-E45
    Case: CM Storm Enforcer
    RAM: 2x2gb Samsung generic
    HDD: Samsung 500GB 5400RPM
    OS: Windows 7 64-bit
    Christian Overclocker

  6. #6
    Good info ... I've been using a 2x memory multiplier with a 400 latch ... the memory is at 1020 though. Thats less than what it's rated at (1066). Should I still increase it's volts? Everything with it is manually set to manufacturer specs:

    2.1v
    5-5-5-15


    Is there a way to monitor NB temps?
    - How to pad-mod/VID-mod your cpu

    Currently waiting for lga2011 to upgrade to new system

    CPU: Intel E8500
    Motherboard: GIGABYTE GA-EP45-UD3P
    RAM: 4gb Corsair Dominator DDR2 1066 w/ RAM cooling fan
    Cooling: CPU/GPU/NB = Water Cooled
    Graphics: EVGA GeForce GTX 260 core 216 (@ 771/1566/1298)
    PSU: Corsair tx 650w

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