5870+5850 Hybrid Crossfire, Need help

I got bored and wanted to see what would happen if I put my 5850 from my other computer into my 5870 rig for x8/x8 crossfire.

So, now I have a rig running x8/x8 Crossfire with 5870+5850. I have one crossfire bridge installed, the power is plugged in for sure, and I am running 11.2 drivers, but my framerate is lower in every game I have played compared to my single 5870 running in x16. Crysis was getting 37fps average at 1920x1080 with single 5870, and now I get 35 or lower with Hybrid CF.

I have read benchmarks comparing x8 to x16 bandwidth. Supposedly there shouldn't be an issue running these cards in crossfire in only x8/x8.

Any suggestions? Thanks

Gigabyte GPA890 AM3 motherboard
AMD Phenom x4 965 @3.9ghz 1.475v 125w (C3)
Gigabyte Radeon 5870 + Gigabyte 5850
Corsair 1333mhz ram X8GB
Corsair TX750w PSU
Coolermaster 690 II Basic Case
Noctua NH-D14 Cooler
D-link Extreme Wireless N PCI
Asus DVD/CD drive
2xBarracuda 7200rpm 500GB HDD
Windows 7 64-bit
7 answers Last reply
More about 5870 5850 hybrid crossfire help
  1. First of all,it's Crossfire not Hybrid Crossfire.The later is when you use a discrete card with a low-end onboard card :)
    Anyway, Crysis doesn't play nice with CF,so how's your FPS in other games ?
  2. some games can't be ran with CF so it's like you're running one card, and usually it's the weaker one
  3. Sorry about the hybrid crossfire being confused with crossfire. Thanks for the info on that, too.

    Every game I have gets lower fps or the same fps. (Usually lower)

    Test Drive Unlimited 2 rarely dipped below 35fps, but now in CF it frequently hits 29fps.

    Mafia 2 benchmark dropped from 53.1fps to 50.5 fps with CF. This could indicate that it is simply only running on the 5850 in Mafia 2 with CF enabled.

    I also have Bad Company 2, Grand Theft Auto IV, Crysis, Crysis Warhead, and Crysis 2 demo, Fallout 3, Dirt 2, MX vs ATV Reflex, Half-Life 1 & 2, Counter-Strike, and a few others.

    I have heard that BC2 is CF enabled, so i'll do a benchmark on that in a minute.
  4. Bad Company 2

    (5870) min- 41 Max- 63 Avg-54.6

    (CF) Min- 43 Max- 91 Avg-57.05fps

    After getting these results, one thing is clear... I'll be sticking to single gpu solutions. lol
  5. Try each card simultaneously and check if either of them is under-performing.
  6. Both cards perform great by themselves.

    In fact, my 5850 scores 54.5 fps in Mafia 2 by itself.
  7. Try tweaking the CF profiles with Radeon pro( http://www.radeonpro.info/en-US/ )
    For example, select BC2.And in the CFX settings,select Alternate Frame Rendering(For MVPU mode) and AFR-Friendly D3D(for "Force CrossfireX profiles") and see if your FPS improves or not
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