I know many have flashed 4.1 to 5.1 and installed the W3680 in '09 Pro's replacing CPU's like mine had - the 2.93 quad. A few apps I use have the need for speed, not cores. What's the best option for a CPU upgrade with a high clock/turbo boost when using one core maxed and maybe a 2nd running at 30% or less? Secondly, is there any way to overclock the CPU when running Win 7 in boot camp? I'd like to hit 4.5 GHz on air if possible. Intel did make a dual core OEM Xeon a couple of years ago stock at 4.4 GHz, but it was for limited release special purpose dual proc machines and the cost was a little high: 44,000 USD for a pair.