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5870+5850 Hybrid Crossfire, Need help

Last response: in Graphics & Displays
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March 12, 2011 2:52:06 AM

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
a c 169 U Graphics card
March 12, 2011 5:06:33 AM

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 ?
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a b U Graphics card
March 12, 2011 10:45:14 AM

some games can't be ran with CF so it's like you're running one card, and usually it's the weaker one
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March 12, 2011 1:20:23 PM

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.

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March 12, 2011 2:25:12 PM

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

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a c 169 U Graphics card
March 12, 2011 5:16:15 PM

Try each card simultaneously and check if either of them is under-performing.
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March 12, 2011 5:24:34 PM

Both cards perform great by themselves.

In fact, my 5850 scores 54.5 fps in Mafia 2 by itself.
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a c 169 U Graphics card
March 13, 2011 5:47:35 AM

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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