Most big-screen HDTV’s only do 120 Hz internally for motion interpolation, and not 120 Hz from a PC. However, some models of HDTV’s can successfully be tricked into accepting 120 Hz signal from a PC through a technique called refresh rate overclocking, using PowerStrip or an EDID override. This reduces motion blur in PC video games played on an HDTV, without the input lag or artifacts of frame interpolation (no Motionflow lag!).
BlurBusters.com announces the HDTV Refresh Rate Overclocking Guide!