hi, I just built my computer and had 1 sapphire 4830 and liked it so much I got a second one. I crossfired them and i went from 10500 in 3dmark 06 and it dropped to 4000. I have ai enabled on standard and I know crossfire is working cause i enabled the logo. I have an amd 9650 2.4 overclocked to 2.6, 4 gigs of ocz 1066 ram and a 550watt rosewill power supply. could my power supply not have enough power? I got the bridges and installed them right, I just dont know what else to do, any help would be great, thanks