I've had my computer for like 3-4 months and I've noticed a deterioration in gameplay. I run a 6800 GT video card on my Dell Optiplex GX620 and the card recommends at least a 350W PSU or greater; the dell only comes with a 305. Everything has worked fine up until now; well actually, it still runs well enough, I've just noticed that it can't seem to handle as much as it used to and it looks a little choppy. Is it possible that my power supply is dying out and therefore the video card is unable to draw sufficient power from it? Also, I've heard from this one kid that he managed to use a regular ATX power supply in the same computer I have. I've heard that my power supply is proprietary so, needless to say, that's why I haven't bothered to try it.