En réalité, les version pc sont bridées =)

"id Software’s Rage launched to critical acclaim yesterday, though some PC gamers were perturbed by the lack of in-game configuration options. The reason for this is that the game dynamically adjusts detail levels at all times to try and maintain an optimum balance between performance and graphical fidelity. Throughout this piece you will find reference to higher resolution textures, which is what we believed the game to be loading when it was first written, but we have since discovered that id Tech 5 is far more complicated than that. However, such is the level of complexity that we believe 'texture resolution,' as used below, is relatable and easy to understand. We must make clear, however, that id Software has not in any way hobbled the PC version of the game, or held back high quality textures. Rather, the underlying technology requires refinement to make better use of the 12GB of high quality textures already available, as we conclude later."

http://www.geforce.com/News/articles/how-to-unlock-rages-high-resolution-textures-with-a-few-simple-tweaks