Thanks, I think a lot of you guys can achieve higher overclocks by upping the PCIE frequency and IOH Voltage as that's the major limitations of high BCLK.
Vcore of 1.2V is very safe as the L5639 is the same with a i7-980X and I've been running a i7-980X with 1.5V at 4.8Ghz for years under water cooling with no problem. Personally, under air cooling, I would say that anything under 1.4V would be safe.
I overclocked my L5639 to 4.29Ghz with a BCLK of 238Mhz and a locked multiplier of X18 on Asus Rampage III Extreme. The Vcore and VTT was set to 1.4V and the PCIE frequency increased to 108Mhz with the IOH Voltage raised to 1.43V and PCIE voltage raised to 1.55V. CPU-Z Validation Link...
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