So, inspired buy all the flashed ATI card threads I got brave and tried to upgrade my 2006 quad core to the 4890. I got the Sapphire Vapour-x 4890. I connected it via the molex to second optical drive connections. I flashed it with Cindori's Zues tool. When I first rebooted to it I had a screen of snow. Eventually this resolved to a decent picture. Programs wont run with it though, things like games crash. Picture didn't seem that great. My main concern is that I noticed fairly quickly that the computer power cord was heating up! It quickly got so hot it was uncomfortable to touch. Rather than wait to see if something burst into flames I powered down and removed the card. So I'm wondering if the power supply for the macpro isn't enough to power this card? Yet many of you seem to be using it without issue? I think I will order the more expensive cables that attach directly to the motherboard. No clue whether this could resolve the issue. Do I need to upgrade the power supply? If so this is getting expensive! Insight and advice would be appreciated.