Hey! You guys have probably been asked this a million times but I'd appreciate a bit of help! I want to upgrade my 5770 in my mac pro 5,1 mid 2010 Processor 2.8 GHz Quad-Core Intel Xeon Memory 24 GB 1066 MHz DDR3 ECC I don't want to have any power issues and was wondering would a gtx 680 work ok or will i need another power source? Final cut, photoshop and other apps like that are what i use primarily with some gaming... Thanks!