I just added a second Sapphire HD 5850 Xtreme to my system yesterday. The Crossfire bridge is connected. My MOBO is a MSI 870-G45.
I went through the automatic setup through CCC. Everything seemed ok. I fired up Battlefield, Bad Company 2 to test out my new setup and it wouldn't play sound! I restarted my system, tried again. No sound in game. I have sound in Youtube and whatnot though... So I figured it was the game. I fired up Brink, and no sound either. So I went back into Bad Company to with FRAPS on to see if my frame rate was at least decent. Loaded into a match and found that my FPS would only go up to the mid 20s and would drop down to 5 FPS under light load!!!
I tried reinstalling drivers and any patches I could find. What is going on?!?! I thought Crossfire was easy and plug and play.
Please help guys. I'm starting to get disheartened.
It could be your PSU.Those CX series from Corsair is more for the budget builder and isn't some of their quality units.It's acutally only capable of deliever 480 watts.And a typical system power draw with a 5850 crossfire is right around 470 watts.
the second slot on that board is 4x not 8 or 16. what that will do to xfire I don't know but I don't think it would be primo. BBC2 is good on a quad core, don't know what you run it on. Brink I don't know. PSU has 45amps. might not be enough. ( forget the "watts" thing )
It turns out it was bad drivers or dirty windows, or both. I formatted and reinstalled Windows 7 and all drivers. It works awesome now! 100 - 130 FPS in Medal of Honor, 80 - 90 FPS in Bad Company 2! Thanks for your input guys.