What is HPET?
What is HPET?
Nothing catastrophic is going to happen if you have it off. There are certain calls in the Windows API that rely on it and allow programmers to get very detailed timing information and set jobs precisely in the future which aren't as precise with it off but most games are designed to work with both possibilities as is all software. You aren't going to notice much difference with it off. I would as a programmer I might be doing some benchmarking of a routine and using the high precision timers and find my resolution was now ~10ms because I didn't have the HPET turned on and hence would need to loop my algorithm a lot to get some accuracy. There is the potential that a game using a frame lock around 60hz might stutter more because the resolution of the timer its using is much worse, but whether you'll even notice or not is unlikely. Besides having a poorly performing HPET which has major DPC issues isn't good for that same game either.