This is my 2nd post asking this question, I apologize to those that make sure no one posts the same question two times! I just ordered a Dell Precision T7500 Workstation. It has a Quad X5570 2.93 CPU. Why didn't Apple use this CPU in the Mac Pro? I also have the Quad 2.93 Mac Pro. The X5570 2x QPI / 6.5 GT/s Takes DDR3 1333 Memory. Retails for $1386.00. The W3540 1x QPI / 4.8 GT/s DDR3 1066 Memory. Retails for $562.00 The Mac Pro Quad 2.93 cost me $3400.00. The Dell Precision T7500 2.93 cost me $2600.00 Is OSX the reason why I spent $800 more for the Mac? I'm getting less CPU, 2YR less warranty, and much less exapndability. With The Dell I can drop 192GB RAM, and a 2nd CPU when needed. Not to mention having the choice of endless video card configurations and a bigger power supply. Or am I wrong on the CPUs?