I currently have 2 crossfired ATI HD4850 GPU's in my computer and I was thinking of upgrading to one ATI HD5850. I was wondering if there is a significant increase in performance for gaming and whether it was really worth the extra money to switch over to the 5000 series?
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The performance at stock will be roughly equal but the HD5850 has a number of other advantages. It also overclocks VERY well, up to the performance of an HD5870 and even higher if you up the voltage. It uses less power than a single HD4850, it's dx11 compatible, supports 3 monitors and in comparison to your current setup it will have no crossfire scalability/compatibility issues. I'd say it's worth it if you can get a decent price selling your current cards.
I would say go for 5770 in crossfire As these two 5770 will out perform 5850 and will give you performance on-par with $400 5870. 5850 is a good choice when you dont have a motherboard which supports crossfire. Since you have a motherboard supporting CrossFire I'd say you to go with 2x5770 And, you'll get DirectX11 Shader Model 5.0 Upto three monitors support