Crossfire two different brand 4850 vs a single 4890

[foxyg]

I found that with rebate from 2 different manufacturer, you can almost buy 2 4850 cards equal to the price of 1 4890 card. The question is will 2 brand of 4850 card work in CF? The FAQ says yes, but anyone really tried it yet? Will 4850 CF always out perform single 4890? Anyone got any benchmark?

 

[boudy]

Yes, 2 different branded cards will work together, and yes, 2 4850s will outperform a 4890.

 

[foxyg]

what about 4890 crossfire vs a 4870x2, are there any bench mark to compair those 2? 4870x2 is about $50 cheaper than 2 4890 cards.

 

[boudy]

In theory, yes, but I cant be for sure since there are no benchmarks out about that.
Could you list the specs of your system? Just so that I know im not suggesting things that wont work.

 

[foxyg]

I ordered phenom II 955 cpu, OCZ 700W PSU, and GIGABYTE GA-MA790X-UD4P board, those can not be changed. The board does have 2 PCI-E slot, 1 at 16x and 1 at 8x, so I can either go with 1 or 2 cards.

 

[Helloworld_98]

^ when you CF it becomes 8x8x not 16x8x.

and if you want dual 4890's then wait for the X2 model, it will have a slight performance boost because there will be more bandwidth between the GPU's. (15GB/s vs about 5GB/s I guess with a CF connector)

 

[boudy]

Just go with a single 4890. That way you can crossfire down the road (when some non-reference cards come out) if you want more performance.

 

[foxyg]

Anyone tried Crossfire with windows 7 RC yet?