I have windows 7 build 7000 installed on my iMac. When running geekbench i get a huge perfomance loss compared to os x, from >4000 to <3400. Is this something i should be worried about and perhaps install another version of windows instead? I do have a perfomance loss on my mbp running xp aswell although not as large, from >3000 to 2800 Is build 7000 long out of date? which build was the last one before they closed the beta testing?