now im not sure what 285 u were looking at, when both cards were current they were about even and the 4890 is xfire did alot better than the 285 in sli, and the 4890 oced better and scalled better with the OC. now once the 285 was outdated there was the image quality nerf that made it quicker but u always needed more AA with the 285 and the 285 did not do proper MSAA so it was costly were the 4890 did dx10.1 so it was free 4x and low cost 8x.
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