I just got an x1900 crossfire edition brand new it ran decent marks in 05 and 06. When I try to go into call of duty 4 i actually lose 15 to 20+ fps with both cards enabled rather than 1. It might be obvious when i ran 3dmark06 it actually powered down on me during the firefly part. So I'm guessing my 550 watt antec power supply just isn't good enough? using e6600 cpu 2 gigs ballistix ram everything runs great till i put the other card in and enable crossfire mode. I tried both cards seperately and they run identical. Thanks for any info...... if anything I can't invest in another power supply I'll just ebay it. This card is brand freakin new what a shame.
