(sorry i dont really know where model 2 discussion should go. got the new one from the news.)
But yeah, i noticed with my pc oc'd at 2.6 and my 1900 (with my old setup) i would get wierd glitches in the graphics and wouldnt always run at full speed.
But i have my OLD setup with a e-geforce 6200 256mb and i get barely any glitches. Then i even plugged in my ancient geforce 4 pci 64mb card, and it too ran almost flawless. just thought it was a little odd, any real reason for it?