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Here we have the twin 4770s and single 4890 going to head-to-head, outperforming the Radeon HD 4870 and GeForce GTX 260. The individual Radeon HD 4770 is included for reference, but really isn’t expected to be a contender here. It’ll be interesting to see what adding anti-aliasing (and applying greater demands to the memory sub-system) does to separate the top two finishers here.
As suspected, a mere 512 MB of frame buffer per card hurts the Radeon HD 4770’s performance, and the 1 GB Radeon HD 4890 takes its lead back. Even the 1 GB Radeon HD 4870 pulls in over the two 4770s at 1680x1050. The difference isn’t huge, but you will need to keep these cards’ limitations in mind. Pushing additional fill rate and compute power only takes you so far once you start turning up resolutions and turning on eye candy extras.