I have a 2009 Quad Core/5770 Radeon which has been problematic, due to Apple bugs and whatnot (USB, eSATA) but which is now, finally well behaved. I'm planning on getting a new Mac Pro too. I'm wondering whether it's worth upgrading or all, or keeping that money for the new Pro. I'll be keeping both computers, the old pro will be reserved for software development. I understand I can actually upgrade the CPU to a hexacore? How much does that run? The other upgrades are graphics cards, but I don't want anything that will be noisier than my present setup.