Overclocking Gigabyte 965P-DS4 and E6420

I'm having some problems overclocking my CPU. I have 2gb 800mhz ddr2 ram and a fairly good graphics card (HD-4850 1gb) but I think my CPU is the bottleneck here as some games lag and changing details or resolution have no or little effect.

Whenever I try to overclock, system shuts itself in some seconds. CPU normally runs at 37 degrees.

Can someone tell me what to do step by step? I tried overclocking to 2.40 ghz from 2.16ghz by changing the fsb from 166 to 200 but my bios reverted back to 2.16 after it shut itself down. Any advices? I have very little knowledge of overclocking from Amiga times :)
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  1. whats your power supply model?
  2. Cooler Master 500W (it says Extreme Power 500W and "RP-500-PCAP" on the box.
  3. Nevermind, I think I found the perfect overclocking for my system.

    I turned off "eist" "c1e" and "visualization"
    Set the FSB to 350x8
    Didn't touch the voltage settings but switched it to manual.

    Changed the memory ratio so that I get FSB-Memory ratio of 1:1
    System is running at 2.8 ghz
    CPU temp is 37 in Vista and 51 when running GTA4 at highest settings and fps is awesome.

    I don't know why I didn't overclock before :)
  4. The computer is the same except I now have 2x2GB Ram running at 800 and a 700watt power supply.

    The CPU is running happily at 3.2Ghz for two years and I didn't even touch voltages, simply upped the bus speed to 400 and lowered memory multiplier to 0.5 so it runs 1x1

    I was wondering if I could overclock the CPU further without breaking stability.

    for example what should I do to overclock to 3.4? Would I need to alter voltages? I never did it before.
  5. Core2 Overclocking Guide
    http://www.tomshardware.co.uk/forum/259899-11-core-overclocking-guide

    Shadow's Gigabyte motherboard OC guide:
    http://www.tomshardware.co.uk/forum/page-245679_11_0.html
    It's for an EP35-DS3L but all the Gigabyte Core2 BIOS's are similar.

    ancalimon said:

    The CPU is running happily at 3.2Ghz for two years and I didn't even touch voltages, simply upped the bus speed to 400 and lowered memory multiplier to 0.5 so it runs 1x1

    To run at a 1:1 ratio, you need to set your System Memory Multiplier to 2.0.
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