Nah has to be some driver setting in Nvidia. 60-90 sounds like the driver toggles perfomance mode up and down.. You can define profiles for each game with Nvidia, I would suggest to try that for ET, and set it to "Power settings" to Max perfomance that should fix it - if it is what I think. Unfortunately my NVIDIA control panel is in german, so I don't know the english names for those things, but it should be more or less what I wrote. lol Alistar - thanks, but I prefer posts in forum, so everyone can profit