Thanks for you replies guys. Actually what's goin on is that the drivers set both 2D and 3D in 500 MHz speed. Now in 3D mode it works perfect, but in 2D mode, unless I underclock it, I get artifacts. Funny thing though that the drivers set it to 500 in 2D. If I attempt to TEST for 499 in 2D it tells me that i cannot test the card and that I must lower the clock. What could be wrong??