I have a very "low" voltage chip, or "golden" rather. Keep bumping up your FSB and running orthos for about five minutes at a time until you reach 4Ghz, then run orthos for no less than four hours. If unstable, be sure your memory has enough voltage, and the multiplier is correct. Then raise the CPU voltage little at a time. You may need to play with your boards MCH voltages too.
Keep it under 60c using Real Temp, and under 1.35v
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CPU: C2D E8400 @ 4Ghz 1.24v
HSF: Apogee GTX
MB: Gigabyte X38-DS4
Ram: 2x2GB G. Skill DDR2-1068
HDD: 320GB Seagate
PSU: OCZ GameXStream 700w
OS: Vista Home Premium 64bit
GFX: 2x HD4850 Crossfire
LCD: LG 22" L226WTQ
3DMark06: 20974
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