Hi, I am currently testing Portal Stories: MEL (Portal 2 mod). This problem is also seen in other games (Borderlands 2), but I'm using this one for reference. FPS_max command is 300 default. Vsync is triple buffered, exclusive fullscreen. Win 7 x64, 372.54 driver. Using the NV Inspector with ~59.7 limit causes microstutter even though FPS is at 59.x ingame. Frametimes are mostly 10-17ms, but with a short hiccup to 20ms. If I limit FPS_max to anything around 60, or use RTSS limiter, there is no microstutter, and frametimes become ~16ms. Can anyone explain this phenomenom? Why is NV Inspector not playing along? Videos: Microstutter, no limit - www.sendspace.com/file/tojxm8 FPS limit 60fps - www.sendspace.com/file/8kgnik PS: ignore frametimes in first video, they double because of recording!