Motherboard Compatibility With 2 Graphics Cards

[haza1889]

I have an ASRock Z77 Pro3 motherboard and I have a Sapphire HD 7770 GHZ Edition Overclocked graphics card and I was wondering if I bought another of the same model of graphics card if my motherboard would be compatible with 2 of them? Tell me if you need any more information, any help would be much appreciated.
Haza1889

 

[wanderer11]

iirc the pro3 is x16/x4. You would get better performance with something like an extreme 4 that is x8/x8. Why not sell the 7770 and get a 7870/660?

 

[haza1889]

I would rather is possible to get another of the same one.

 

[alexoiu]

http://www.tomshardware.co.uk/forum/310121-12-crossfire

 

[haza1889]

Sorry I don't really see how that relates to what I'm asking?

 

[alexoiu]

It's about performance. Depending on your PSU, the board probably does support Crossfire with 7770. Will the performance gain justify the spent money?
http://www.overclock.net/t/867370/x16-x4-crossfire-performance-hit/20

 

[haza1889]

Why does it depend on the PSU?

 

[alexoiu]

For Crossfre you'll need a 700 - 800W PSU with 2 PCIe power connectors. AMD recommends minimum 600W.

 

[haza1889]

Well I have a Corsair TX-750 V2 750W Enthusiast Series Power Supply. So that's fine... I am just wondering if it would work and if so what performance increase (if any) would I get?

 

[alexoiu]

If 30 days return policy is available, buy the card, test it in Crossfire and if happy, keep it.
Some more tests: http://www.overclock.net/t/967533/crossfire-x16-x4-vs-x8-x8-comparison
or http://www.insidehw.com/reviews/graphics-cards/6178-crossfire-x8x8-or-x16x4-the-ongoing-dilemma