Test

dirk@fun:~$ kwin --replace
OpenGL vendor string:                   NVIDIA Corporation
OpenGL renderer string:                 GeForce 9500 GT/PCI/SSE2
OpenGL version string:                  3.3.0 NVIDIA 270.41.06
OpenGL shading language version string: 3.30 NVIDIA via Cg compiler
Driver:                                 NVIDIA
Driver version:                         270.41.6
GPU class:                              G80/G90
OpenGL version:                         3.3
GLSL version:                           3.30
X server version:                       1.10.1
Linux kernel version:                   2.6.38
Direct rendering:                       yes
Requires strict binding:                no
GLSL shaders:                           yes
Texture NPOT support:                   yes