I sold off my 2007 Mac Pro, and need to pull the trigger on a new 2009 single core box. I see two choices I can go with..... 1) Buy the 2.66 Version($1999). Replace the CPU with a Core 'i7975 3.33 Ghz chip for around $800. - total Base cost - $2799. 2) Buy the 2.93 version($2399). If I go with option 1. Is there ANY way, like the old BSEL mod on the 2008 MacPros where the multiplier or bus can be manipulated. It's an unlocked chip. Thx!