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Windows 7: Motherboard + Crossfire

16 Jun 2010   #1

Windows 7 Ultimate
 
 
Motherboard + Crossfire

I have an Gigabyte P55A-UD3 (ver. 1) It has 2 PCIe slots, 1 is x16 and the other is x4. If I run 2 HD5770's in Crossfire am I going to see a jump in FPS/Performance? Or would I be better off finding a mother board that has 2 PCIe x16 slots? I'm very new to crossfire/Sli, last computer I had in SLI had 2 VooDoo 2 from 3dfx. :-)

Thanks,

Zach

My System SpecsSystem Spec
16 Jun 2010   #2

7 Ultimate x64
 
 

16x4x Crossfire doesn't perform as well as 8x8x and is nowhere near 16x16x. However, two 5770's would not saturate an 8x8x lane. Unfortunately, you've got a 4x slot. Best advice: get a faster card or a board that supports at least 8x8x. 16x16x you could not make use of given two 5770s.

Quote:
Putting current graphics cards in a PCI-Express x4 slot basically verges on madness and incurs a performance hit of between 25 and 33 percent. Even if the motherboard in question were especially cheap, the card’s price/performance ratio is affected immensely. When using an x8 connection, performance also decreases, albeit only by 7 to 8 percent.
From the conclusion.
Crossfire meets PCI Express 2.0 €“ More Lanes, More Frames? : Crossfire up to 20 Percent Faster
My System SpecsSystem Spec
16 Jun 2010   #3

Windows 7 Ultimate
 
 

My System SpecsSystem Spec
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16 Jun 2010   #4

7 Ultimate x64
 
 

Oh yeah. Gigabyte has been coming out with some impressive stuff lately. Their ultra durable products are top notch.
My System SpecsSystem Spec
16 Jun 2010   #5

Windows 7 Ultimate
 
 

I have the GIGABYTE GA-P55A-UD3, so I wonder if I can just swap motherboards and not have to change crap on the OS install to use it...Would this board allow me to run at PCIe x 8 on both cards?
My System SpecsSystem Spec
16 Jun 2010   #6

7 Ultimate x64
 
 

Yes, you can run at 8x8x. No, you will not have to reinstall the OS.
My System SpecsSystem Spec
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