Just upgraded my mac pro 1,1 from a non apple 8800gt to another non apple card, a PowerColor Radeon Hd 5770. The card makes a buzzing noise which I have surmised is the cards vibration on the ram cage. I took the power cable and stuck it underneath and the vibrations are practically non existent. The cage doesn't feel too hot at all but I was wondering if this is going to make the wire fail? or is there another solution one of you could let me know.