I have a Sapphire x1900xt 256mb. Whenever I play a game for awhile(15 minutes or so) my computer shuts off. I havn't overclocked anything. I figured that stock cooling would be enough. Im idling at 52C, not sure how much at load. Im just assuming that this is the reason that my computer is turning off, i am a complete noob. <img src="/images/smilies/redface.gif" border="0" alt="" title="Embarrassment" class="inlineimg" /> Thanks.