I got my Athlon XP mobile 2600+ to about 2.5Ghz (217x11.5), and now I'm thinking about overclocking my radeon 9800 pro, but I'm not sure how much it can be safely overclocked with the stock cooling. Is it ok to keep increasing the core/memory speeds until you experience artifacts in 3d games/3dmark? Does overclocking shorten the life of the video card at all?