Crossfire two different brand 4850 vs a single 4890
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?
More aboutcrossfire brand 4850 single 4890
Yes, 2 different branded cards will work together, and yes, 2 4850s will outperform a 4890.
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.
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.
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.
^ 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)
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.