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5850 Xfire, no performance boost

Last response: in Graphics & Displays
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January 12, 2010 4:57:50 PM

Hi, I've been a reader but haven't posted anything before
But I've come to a problem which I don't know if it's just me or am I doing something wrong

First off here's my rig
AMD 955BE (Overclocked to 3.8ghz stable)
MSI 790GX-G65 (I know it's x8/x8, but the benches shouldn't be the same as single)
Corsair 1333 Ram 2gbx2 Total 4gbs
2x HD5850 in xfire (Tried overclocking both gpus to 775/1125 via CCC)
750w PSU
Windows 7 Ultimate
Running my screen at 1920x1080

Ok here's my problem, I'm not getting any performance boost from my 5850 xfire setup
Sometimes even losing fps

Unigine Heaven Benchmark, 1920x1080, 8xAA, 16xAF, Fullscreen, 34 Fps (Single 5850), 35 Fps (Xfire 5850)
3dmark06, 21xxxx (Single 5850), 22xxx (Xfire 5850)

Here's more info:
Uninstalled both display drivers, reinstalled using the newest 9.12 drivers provided by ATI,AMD
Reseted CCC to factory defaults, CCC states Xfirex enabled after reboot
Using the lastest GPU-Z, under xfirex, it says "enabled, 2gpus"
While I'm playing games and running benches, there is a ATI xfirex logo on the upper right hand corner of my screen

Best solution

January 12, 2010 5:16:44 PM

1) Check to make sure that the crossfire cable is properly inserted. You only need one, and because they are delicate one may be damaged. Try using one, then the other.

2) Use drive cleaner pro to remove the old drivers. Crossfire is particularly finicky in that regard. Personally I'd recommend a clean install :D .

3) Run more bench marks. It could just be your CPU bound. A 5850 is alot of GPU power. Also crossfire adds some CPU overhead, more so than SLI, so you can actually loose a few FPS if it's your CPU that's being taxed. Also be sure to run the benchmarks more than once both with single, and crossfire cards.

4) Make sure you aren't running too much crap in the background when benchmarking. Macafee or Norton running in the background can suck up alot of resources :D .
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January 12, 2010 5:19:16 PM

I'd definately run 3Dmark or some other software. Heaven Benchmark is buggy and might not support Xfire. I can't even run Heaven with 2 monitors. I have to unhook one and turn off my physX card for it to run. It also wouldn't run on 2 monitors on a single card with no physX card present.
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January 12, 2010 5:29:30 PM

Try some games while your at it, MW2, Crysis, Far Cry 2, L4D, etc.
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January 12, 2010 5:58:13 PM

K, used driver sweeper from guru3d
Drivers are cleaned, reinstalling drivers
I have MW2
Have to install Crysis (retarded game takes long to install)
Updated my bios

Gonna check benches again

If that don't work, I'll do a clean install

I'll keep you guys posted.... mayb after hours of benching and installing stuff
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January 12, 2010 6:37:53 PM

HKH said:
K, used driver sweeper from guru3d
Drivers are cleaned, reinstalling drivers
I have MW2
Have to install Crysis (retarded game takes long to install)
Updated my bios

Gonna check benches again

If that don't work, I'll do a clean install

I'll keep you guys posted.... mayb after hours of benching and installing stuff


For me Crysis didn't take any extordinary amount of time, you need to understand you are installing over 1 gigabyte of textures, the most advanced in-engine physics system.
40 Min should be plenty.
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January 13, 2010 11:45:50 AM

Hey Guys, got abit of update
I did a clean install
Installed 2x5850 in crossfire

Heaven Benches: 35 (Single 5850 x16), 41 (Xfire 5850 x8/x8)
1920x1080, 8xAA, 16xAF, DX11, Tenselation On

Crysis 1.2 Benches: 28-30 (Single 5850 x16), 42-45 (Xfire 5850 x8/x8)
1920x1080, 8xAA, Very High Details

From these benches, it seems like my xfire is working

Just one weird problem
3dmark06 still doesn't utilize my xfire setup still 21000-22000 for both single and xfire, to be honest, I only have the free version of 3dmark06, and everything runs at whatever default it comes with, one weird thing is that when running single card, 3dmark06 renders at full screen 1280x1024, but with xfire, it scales down to 1280x1024 with black boarders to the sides, while I understand that xfire fails to run in windowed mode, but wouldn't 3dmark06 run at fullscreen for xfire even if it's the free version?
I mean, it's only 3dmark06 causing problems, other games and benches are fine

So thank you all who helped.

But there is still one little thing that bugs me, even on xfire, my benches are still lower than people who the same xfire setup but with a "stock" i7-860 =.=
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April 8, 2010 11:41:58 PM

HKH said:
Hey Guys, got abit of update
I did a clean install
Installed 2x5850 in crossfire

Heaven Benches: 35 (Single 5850 x16), 41 (Xfire 5850 x8/x8)
1920x1080, 8xAA, 16xAF, DX11, Tenselation On

Crysis 1.2 Benches: 28-30 (Single 5850 x16), 42-45 (Xfire 5850 x8/x8)
1920x1080, 8xAA, Very High Details

From these benches, it seems like my xfire is working

Just one weird problem
3dmark06 still doesn't utilize my xfire setup still 21000-22000 for both single and xfire, to be honest, I only have the free version of 3dmark06, and everything runs at whatever default it comes with, one weird thing is that when running single card, 3dmark06 renders at full screen 1280x1024, but with xfire, it scales down to 1280x1024 with black boarders to the sides, while I understand that xfire fails to run in windowed mode, but wouldn't 3dmark06 run at fullscreen for xfire even if it's the free version?
I mean, it's only 3dmark06 causing problems, other games and benches are fine

So thank you all who helped.

But there is still one little thing that bugs me, even on xfire, my benches are still lower than people who the same xfire setup but with a "stock" i7-860 =.=



Ofcourse you get lower FPS.... its x8x8 Xfire
SLI on your current board is a waste
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April 9, 2010 3:07:42 AM

Right... thx for necroing my post, anyways, I bought another board a while ago
and changed my whole setup to x58

Currently running i7 930 + 2x5850 at full x16/x16 speed

Yes the x8/x8 was holding it down abit, but only around 5-7%
But the cpu is what is making this rig shine right now
I have the 930 overclocked to 4ghz for a 24/7 use

Anyways, x8/x8 isn't acutally that bad, but I mean, x16/x16 790FX boards are not
much more expensive than 790/890GX boards.
So yea, buy 790FX boards if your a AMD setup

Oh yea one more thing, 3dmark06 calculates heavily on cpu performance
An overclocked 955BE at 3.8ghz is normal around 22000 for 2x5850
Right now it hits around 29000 for my i7 rig
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April 9, 2010 3:11:58 AM

Best answer selected by HKH.
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