Like many of the thousand-dollar, high-end processors of late, the Core 2 Extreme X6800 has an unlocked multiplier, so overclocking this beast is simply a matter of turning up that value in the BIOSeven on an Intel motherboard. With very little effort, I had the X6800 running at 3.46GHz on a 1066MHz bus. This was with air coolinga Zalman CNPS9500 LED. That's very good air cooling, yes, but nothing terribly exotic.
I had to raise the voltage from the stock 1.2V to 1.375V in order to get it to be completely stable, but at those settings, the CPU ran a pair of Prime95 torture tests for a good while without throwing any errors. With the cooler fan running at its top speed, the CPU leveled out at about 70°C while running those tests.
I tried to coax the X6800 into running at the next multiplier up the ladder, for a top speed of 3.73GHz, but it wouldn't quite go there. Even with 1.45V flowing into it, the X6800 would POST but wouldn't boot into Windows. I suspect this CPU could go well past 3.46GHz with some bus overclocking, but I haven't tried it yet. Even at "only" 3.46GHz, performance was astounding.
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