I'm ready to go pick up a 6800gt OC, but I have one concern: What is the sound level on these things? I currently have a 9800 pro with a vga silencer on it. My computer has 2x 120mm vantec stealth fans @7v and a super silent psu. I cannot hear my computer from 5 feet away. I need to know how silent this is going to be, and if its going to be a problem--any silent after market coolers for it??? THANKS!!!