I've been looking at 2008 Mac Pros on eBay, they go for about £500-600, (2.66GHz quad core model), is it worth it? I was hoping I could get one and just drop in a Radeon 5850. About Radeon 5850, I have one lying around, is it possible to use it without flashing it? (I don't think I have a PC that I can use to flash it.) The Mac Pro would be running either Mavericks or Yosemite, which I believe has native support for 5850, or would I still need to flash it to be able to use it?