HD 4850 and is a little more powerful than the 9800 especially at 1920 x 1200 resolution. At 1680 x 1050 resolution they kinda trade blows so they are equal, maybe the 9800 would be a little faster.
The HD 5750 is equivalent to the HD 4850 with DX11 support and consumes less power than both cards. However, it is slightly more expensive since it is new.
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