Okay I am pretty stupid. I was going to get the 2.8 760 i5 all along when I read on a forum that it is easier if you use a CPU that OS X supports otherwise you have to do soemthing to the kernal to get it to boot.... and I read that the 2.66 750 is supported... so I went ahead and ordered the 2.66 before even checking to see that Apple has iMacs with a 2.8 i5... sigh... the shipment has shipped so I can't cancel it. CRAP. It's not the end of the world.. I could always overclock it?