I tried using all of the different buffer sizes but I'm the getting the problem as stated above. Besides the sound, everything else is stable at 60fps (that's what it's telling me) and it can achieve higher rates

Game: Rez

Build: NullDC 1.0.4 Jun 20 2010
Sync to audio,
Global focus,
Use Hardware Mixing,
Limit Speed and Sync Audio,
Dsp Emulation,
Are checked, as well as Vsync
Dynarec, CP pass, underclocking are enabled

Intel Core2Duo P7450 at 2.13
Nvidia Geforce GTX 260m 1gb gddr3
W7 HP
4GB DDR2 at 800mhz
This is a laptop btw