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HD5850 CF bad peformance? - Page 5

post #41 of 95
Thread Starter 
Quote:
Originally Posted by Sir Amik Vase View Post
Probably has already been said but to me it sounds like your PSU cant power both your cards
As said i have tested it on another psu, even 2 psu's together, even another system, so that is not the issue. Also with to low psu the cards would peform badly in the combined test of 3dmark, but they dont, they just peform badonly in games.
    
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post #42 of 95
Quote:
Originally Posted by Sir Amik Vase View Post
Probably has already been said but to me it sounds like your PSU cant power both your cards
That's what it sounds like...

650+ Watt from a quality PSU brand as recomended by every review..

Even more with an overclocked system...
post #43 of 95
Thread Starter 
Quote:
Originally Posted by antuk15 View Post
That's what it sounds like...

650+ Watt from a quality PSU brand as recomended by every review..

Even more with an overclocked system...
It may sound as it yes, but as i told like 5 times now, i have tested with an corshair 650w hx and still same issue. (i know this psu will handle 2 of theise cards) i even put 2 of them together for minimum load, and same issue.
    
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post #44 of 95
Thread Starter 
Quote:
Originally Posted by pez View Post
Alright now try 10.10, 10.9, and 10.8. It's a matter of finding drivers that work the best for you. I can't honestly remember the on that worked right for me, but I want to say it was 10.9.
Hm im having issues finding the 10.10 cap2, Do i rly need it, or can i just use the newest cap whitout issues ?
    
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post #45 of 95
PSU is not an issue. But is it still slow without oc?
post #46 of 95
Thread Starter 
Quote:
Originally Posted by Riou View Post
PSU is not an issue. But is it still slow without oc?
Ill repost this since ppl dont read all the post (that i understand

The problem:

The Crossfire connection works (enabled in ccc, shows up on gpu-z and msi afterburner) But it does only work in benchmark, like 3dmark, CSS ingame benchmark, and some game menues, when i start to play the actual game the load drops from 90%+ to 25-30% But crossfire logo is showing so crossfire is enable, aswell the load is 25-30% on both cards. This equals that i have less peformance in games with crossfire since the card only loads 25-30% then a single card that loads 90% +

So i dont understand what the problem is since the card works flawlessly in test but not in games =/

I have tryed this:

-The following drivers have been tested: 10.11 | 10.11a | 10.10 | 11.1 | 11.2 Also the app profiles was installed correctly.

-Clocking down cpu to stock, and up to 4ghz, no change.

-The bios has been flashed, also the card is in the correct slots with bridge connected.

-Tryed another more high power psu, same problem, did 2 psu's together, same problem.

-Tested them on a newer system with i7 cpu, same problem

-Enable ulps and catalyst AI has been set to every option avaible same issue.

-Clocked up, and declocked the cards, nothing changed.

-Changed the order of the card, and turned around the bridge, same problem

-Checked everything in bios, nothing wrong there, pci-e freq is 100 when oc'd cpu, [auto] when running standar bios settings.
    
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post #47 of 95
have you considered that only some games fully use the crossfired cards?
In some games you will see no boost, some several more FPS, while others will be almost twice as fast
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post #48 of 95
OP, I have a feeling it might be your processor bottlenecking your crossfire setup.

Crossfire requires alot more CPU power compared to a single card, and since BC2 is very processor-heavy I think this may be the reason you are only getting 50fps~ on your dated LGA775 processor..

The only solution is to overclock it as much as possible, you could easily gain another 300mhz on that Q9550. Otherwise get a new CPU.
Edited by OverTheBelow - 2/22/11 at 8:04am
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post #49 of 95
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Quote:
Originally Posted by thealex132 View Post
have you considered that only some games fully use the crossfired cards?
In some games you will see no boost, some several more FPS, while others will be almost twice as fast
Yes ofc. tho i know that bc2 do support CF
    
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post #50 of 95
Quote:
Originally Posted by Concker View Post
Yes ofc. tho i know that bc2 do support CF
Not for me?
Sure it supports it but after BC2 updated to R8 crossfire just was worse, its the game not your cards. If crossfire is working in benchmarks such as Heaven 2.1 and 3DMark then its working fullstop. Your CPU @3Ghz would bottleneck like max 2%.
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