I've read several things on AVS and elsewhere saying twiddling with the latency of the video card can reduce or eliminate many cases of stuttering and other 'oddities', for this one can use Powerstrip or LtcyCfg. I have both but am nervous about possible effects of doing this. Am I right in thinking changes made by these tools are 'lost' during a reboot, meaning any bad change can be backed-out by re-booting in Safe mode? It's unclear to me whether these are 'poking' values into the hardware or BIOS that somehow could survive a reboot and hence be damned hard to recover from. Has anyone here done this sort of tweaking? I'm not a n00b by any means to PCs ... building them or destroying them ... but a hardware expert I am not so words of advice before doing something serious would be appreciated.