When beginning with the Nexuiz game, most graphics cards with the Radeon Gallium3D driver did benefit from the PCI-E 2.0 speeds. The graphics cards not benefiting from double the PCI Express performance were the Radeon HD 4670, HD 6870, and HD 6950 graphics cards. For the graphics cards that benefited from PCI-E 2.0 with Nexuiz, the HD 4770 frame-rate was up by 44%, the HD 4890 was up by 64%, the low-end HD 5450 up by 25%, and the mid-range HD 5750 ran up by 54%.
With Lightsmark the HD 4670 did benefit from the doubling down on the PCI Express speeds with its frame-rate going up by 20%. The Radeon HD 4890 Lightsmark performance was up by 36% and the HD 5750 shot up above 60 FPS with a 23% boost. The Northern Islands / Cayman hardware was being unstable on the Mesa 8.0-devel revision used in this configuration.