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Crossfire performance

Jackaby

Jackaby

Jackaby

Associate
Joined
9 Jan 2010
Posts
339
Location
Brighton, England.
Recently upgraded from a single Sapphire HD 5850 to 2x 5870 Vapor-x's.

I now run BFBC2 at much higher graphics settings and with no issues, but when I booted up Fallout: NV it was almost unplayable. Out of curiosity I disabled Crossfire and and reloaded Fallout and it's running at Ultra high with no performance dips.

Also tried Assassins Creed 2 and it seems to also be working better with the single card - bummer.

System specs are:

Intel i5 750: stock 2.67Ghz
2x 5870 Vapor-x's
8GB Corsair Dominator 1600Mhz ram
Asus P7P55DLE Mobo
WD caviar green 1tb 7200rpm
Corsair 850watt PSU

Any advice would be greatly appreciated.
 
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Unfortunately, with that motherboard the second main PCIE slot is only capable of running at x4 speed - so this may be bottlenecking the performance of the second card and generally dragging down your performance in games.

Can also just confirm that you are using the latest drivers?
 
Yup latest drivers are installed. I believe on a tech site I saw that the second PCIE slot at default ran at x4 but could be edited in the bios to run at 16x
 
ATI Catalyst Application Profiles 455 KB 10.11 CAP1 11/17/2010
Description:
This release of ATI Catalyst™ delivers support for the latest ATI CrossFireX™ profiles in a separate executable file ensuring users have access to the absolute latest set of profiles installed on their PC.

New profiles added to this release:
- Nostradamus: The Last Prophecy – resolves negative CrossFire scaling
- DarkFall – Forced on Anti-Aliasing through the Catalyst Control Center has been
Click to expand...

http://sites.amd.com/us/game/downloads/Pages/crossfirex-app-profiles.aspx
 
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Welcome to the mystifying world of dual GPU's.

I think a H57 chipset board is what your looking for, but you would be better of asking in the motherboard section TBH.
 
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Before you go and buy a new motherboard check that the pcie slot really is causing the problems - can you disable the x16 slot (or pull the card) and verify if the game runs smoothly or not with a single card in the x4 slot. It may just be one of those games that hates crossfire/sli so worth checking before you shell out for a new mobo.
 
^Andy^ said:
Before you go and buy a new motherboard check that the pcie slot really is causing the problems - can you disable the x16 slot (or pull the card) and verify if the game runs smoothly or not with a single card in the x4 slot. It may just be one of those games that hates crossfire/sli so worth checking before you shell out for a new mobo.
Click to expand...

Good point - definately check this first.

If you get the same problem I do suggest changing the board tho. Must have spent ~£600 on those graphics cards, all to be bottlenecked by the motherboard is a real shame.
 
Fallout NV and Assassins creed 2 are both flawless on each card individually. But xfire renders new vegas unplayable and some big unpredictable lag dips on assassins creed 2.

Must just be the x4 pci that's harshly bottlenecking the first card.
 
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