waka - you read slightly incorrect information - it depends on the capabilties of the video card - and settings - I base this on the fact that I can get FPS higher than 60 PROVIDING I use the nvidia control panel, and adjust my settings to override "software control" and disable the "restrict refresh to monitor vsync".
Now in Windowed mode - I too get the topped 60fps... and this seems to be GDK related based on the fact that my latest DirectX deep dives have allowed me FPS in the 300fps range on my slow pc - IN WINDOWED mode! (funny thing is - haven't put my finger on it - in the project I'm doing in raw directx, the fps is higher windowed than full screen! LOL)
Lilith, you might have some settings in your video card that are likewise controlling your fate. As mentioned earlier the difference between software rendered and hardware acceleration can be significant as can CPU performance, and multimedia extensions I believe still may have an impact but this I'm not to sure on.
You might need to make a few benchmark timers in your functions - time in and time out - and analyze where you're code is spending the most time and work your way down - and see if the heavy spots might have any corrulation with how the rendering is happening for your different hardware setups.
-Jason
[edit] I wouldn't of wrote all this if I saw "Page 2" of this thread before I hit POST LOL