i was running the core clock at 775 and left the memory alone.
it got up to 69 degrees and was doing fine.
then i started getting horrible FPS and my screen went black. i had to do a hard boot. before this card i had ati and heard so much good stuff about nvidias cards so got one. sure it was a cheap one but i'm so disappointed in nvidia. ntune is so unstable. no overclocking tools work right with the card, and it sucks. a 100 dollar card from ati would perform better, i guess nvidia only makes decent high end products. and now the 4800 series is taking care of that.