EP45-UD3P First Overclock Stability Problems

Hey guys,
This is my first overclock and it was fine when running xp i ran Prime 95 for about 4 hours and thourght it would be ok and it never crashed in XP. Then i switched to windows 7 64bit 7100 build, which is fine but when playing games and watching movies etc it sometimes freezes then goes to a blue screen. I thourght it could be a driver issue so i have the latest drivers for my video card, sound and directX.

I was reading in the forums that i have to run prime 95 for at least 12 hours so i set it going and i got an error after 5 hours 25 mins. I have also run memtest+ passing 3 times with each module on its own and then together. So i don't think its memory. Then i was speaking to someone and they said i might have to up the southbridge voltage a little bit as it is related to the video card.

So could someone recommend some settings to use to fix my stabilility issue.

my spec is:
Mobo - Gigabyte EP45-UD3P
CPU - Intel Core 2 Duo E8400 3.0 Ghz (OC 4.0 Ghz)
Mem - OCZ Gold Series DDR2 1066 mhz 4GB
PSU – Coolermaster eXtreme power duo 650watt
GPU – Sapphire HD 4870 1GB
CPU Cooler – Arctic Cooling Freezer Xtreme – with thermaltake back plate kit
HDD - 250GB Seagate 7200.12 SATA 300
HDD 2 – 500GB Seagate 7200.12 SATA 300
DVD RW DL
Monitor - Samsung T240
Case Antec Three Hundred


Thanks Guys
Alex
5 answers Last reply
More about ep45 ud3p overclock stability problems
  1. My current bios settings are:

    Robust Graphics Booster - Auto
    CPU Clock Ratio - 9X
    Fine CPU clock ratio +0.0
    CPU frequency 3.99Ghz (444 x9)
    CPU Host Clock Control - Enabled
    CPU Host Frequency (Mhz) - 444
    PCI Express Frequency (Mhz) - 100
    C.I.A.2 - Disabled
    Advanced Clock Control
    CPU Clock Drive - 800mV
    PCI Clock Drive - 900mV
    CPU Clock Skew - 0ps
    PCI Clcok Skew - 0ps
    Performance Enhance - Turbo
    (G) Mch Frequency Latch - Auto
    System Memory Multiplier SPD - 2.40B

    Normal Current
    Memory Frequency (Mhz) 800 1066

    DRAM Timing Selectable SPD Manual
    CAS Latency Time 5 5
    tRCD 6 6
    tRP 6 6
    tRAS 18 18
    Advanced Timing - All Auto in sub Menu
    Load Line Calibration - Disabled

    CPU VCore 1.27500V 1.25000V
    CPU Termination 1.200V Auto
    CPU PLL 1.500V Auto
    CPU Reference 0.760V Auto
    MCH Core 1.100V Auto
    MCH Reference 0.760V Auto
    MCH/DRAM Reference 0.900V Auto
    ICH I/O 1.500V Auto
    ICH Core 1.100V Auto
    DRAM Voltage 1.800V 2.100V
    DRAM Termination 0.900V Auto
    Channel A Reference 0.900V Auto
    Channel B Reference 0.900V Auto

    Thats its

    Cheers
    Alex
  2. any ideas?
  3. Your overclock isn't stable. Try bumping the cpu vcore and/or the cpu termination voltage up a little and test it again. Read the overclocking guides.
  4. Raider00657 said:
    any ideas?


    I would up your Northbridge a bit if your going to 4ghz, its way too low at 1.1v thats just my 2 cents. Good luck with the overclock, FSB termination should be fine at 1.2v but if not try playing around with NB first then with FSB termination second and it should be stable after upping one of those two (or both) by a few volts, if you can start prime and go for twelve hours then something there only needs a slightly bit more voltage. Of course you could always just simply have a bad e8400 that is vcore hungry too :p
  5. its seem like u always set the auto setting,u must remember sometimes auto setting is not good for overclocking you don't know how much the volt, sometimes very low or high.
    try for this setting and use multiply 10X.

    CPU V CORE-1.45.
    CPU TT-1.38.
    CPU PLL-1.5.
    CPU Reference-Auto.
    MCH Core-1.38.
    Dram V-2.04 for 4 g or 8g 2.08v
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