Mine is running at max graphics with a 560Ti and an overclocked Core 2 Duo E8400 @ 4.0GHz. Didn't lag until I started tweaking LOD, others effects and adding a gazillion texture packs o.O Definitely making me thinking about those juicy 670Ti cards coming out with 2GB of gcard ram, though an SSD could also help with the caching aspect but alas that money I'd rather spend on a gcard haha :-)