Horrible FPS and no sound in game - Crossfire 5850s

[full_out]

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.

 

[full_out]

Oh ya, Corsair Builder Series CMPSU-600CXV2 600W ATX Power Supply Active PFC 120MM Fan power supply

 

[purple stain]

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.

What are your full system specs?

 

[swifty_morgan]

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 )

 

[full_out]

Has anyone had issues with no sound in game while in crossfire? It seems kinda weird that there is sound in windows but none in game.

 

[purple stain]

What are your full system specs? (CPU,RAM,Mobo,etc.)

All of this could easily be cause by incifient power.

 

[full_out]

-AMD Phenom II 810 quad core cpu 6mb cache 2.6 (Overclocked to 3.2 stable)
-2x4GB Corsair vengence 1600
-1 TB Seagate 7200 rpm hard drive 32mb cache
-Sapphire HD 5850 Xtreme video card 1GB ddr5 (725 core/4000 mem) X2 Crossfired
-MSI 870-G45 MOBO
-Corsair Builder Series CMPSU-600CXV2 600W ATX Power Supply Active PFC 120MM Fan power supply
-120mm silverstone rear fan, 120mm 3 speed front fan

 

[full_out]

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.

 

[purple stain]

Welcome.Glad you got it fixed.

 

[full_out]

Best answer selected by Full_out.