Hi. I figured I'd ask you guys about a crossfire problem I'm having on my x1950 pro graphics cards. I've tried 4 different motherboards so that's not the problem. I have a crossfire certified powerexpress psu for the cards' power. I have crossfire certified memory. yadda yadda. Everything is certified except for the floppy drive. =) I've talked to ATI and they spent 3 hours working with me on trying to get crossfire working and so far no luck. They told me there going to build my computer as there facility and try to recreate the problem. In the mean time maybe someone in the forum has had the problem or can suggest a solution. The specs. -P4ht 550 3.4ghz -1024 Kingston hyperX pc6400 ddr-2 -Intel D975XBX2 (other boards tested were MSI p975 platinum, Asus P5B deluxe, Asus P5W DH Deluxe) -ATI x1950pro crossfire (the ones with the internal connector) -2 x 80gb Sata Raid-0 -Antec trupower 480 (main psu) -Thermaltake powerexpress 250 (crossfire psu) MISC info. -All the latest drivers (cat 6.12) and BIOS updates were used on my tests. The problem. The drivers are installed correctly and I'm showing 4 adaptors in the device manager. Crossfire is ticked in the control panel to enable it. The Thermaltake powerexpress has 2 green lights indicating power is being drawn from each card while running a 3d application. Framerates remain unchanged in my games and my 3dmark05 score is 9500 +/- 50. If I uncheck crossfire in the control panel I still score 9500. If I completely remove the secondary card from my computer I will get the same score of 9500. So somehow crossfire isn't helping any. ATI seems to be stumpped as well. Other notes. Internal bridge is connected. I have tested each card by itself in either slot and any configuration will work fine as long as it's a single card. ATI had made the suggestion that I could have had a bad card and I have exchanged them both for two replacements and still have the problem. Has anyone else has issues with the x1950 pro running in crossfire? Perhaps I have a faulty bios revision on the card itself. Rabit shows 113-A99902-111 RV570 BIOS 688m/574e. Thanks and hopefully someone out there has better suggestions then ATI.