Is the GPU client for Windows XP only? Has it been tested on other OSs like Linux, Mac, and Vista?
We will launch with Windows XP (32 bit only) support due to driver and compiler support issues. In time, we hope to support Linux as well. Macintosh OSX support is much further out, as the compilers and drivers we need are not supported in OSX, and thus we cannot port our code until that has been resolved. Users have reported the GPU client works in Vista, but due to a different DX version, the performance characteristics vary slightly from Windows XP.