在DX9模式下,Radeon HD 5870/5850牢牢占据榜首,GeForce GTX 285/275则位列其后,有不小的差距,另外Radeon HD 5770和Radeon HD 4870 1GB/512MB基本处于同一档次。 而切换到DX11之后,性能损失非常明显,Radeon HD 5800系列四款型号在各种分辨率下全部丢掉整整三分之一的帧率,Radeon HD 5870只能介于GeForce GTX 260-216和Radeon HD 4890之间,Radeon HD 4850更是仅仅相当于DX9之下的Radeon HD 5750,而Radeon HD 5700系列甚至已经不如GeForce 8800 GT了。
如果要在游戏里获得足够的流畅度,帧率不应低于40FPS,照此计算GeForce 8800 GTX/GT只能在较低分辨率下可用,到了1920×1200分辨率后至少也得是Radeon HD 5770/4870。单就DX11来说,Radeon HD 5800系列用户完全可以使用新的渲染模式,Radeon HD 5770系列最好就免了,只能在1280×1024分辨率下勉强体验体验,或者可以考虑关闭AA/AF。
PCGH原文对DX11画面的评价:
In a direct comparison the differences on the audience only become noticeable if you get close and pay attention - some more polygons in the right place make the figures look a little better. The flying flags are "nice to have” while the improved water visualization is really good: The car really ploughs through the water and builds up a little bow wave - additional particles on splashes make the whole scene more realistic. But the biggest difference between DirectX 9 and DirectX 11 is the illumination. Due to HDAO and nice Post Effects the visual appearance of Dirt 2 with DirectX 11 is less "overbright” and smoother. The more realistic look of the DirectX 11 version might convince some players