So what can I run with this?

Getting a new laptop this week. Not expecting Crysis on high or anything, as I only paid $450, but I do want to play TF2, L4D2, and maybe Borderlands and Fallout 3. Just Cause 2 would be nice, but I know I probably won't be able to.

AMD Turion II Dual Core M520 Processor ( 2.40GHz 667MHz 1MB )

ATI Mobile Radeon HD4200 512MB

3 GB PC2-6400 DDR2 SDRAM 800MHz

So, will I have any luck running at least TF2?

TF2 - On low L4D2 - On low Borderlands - No Fallout 3 - No JC2 - Not a chance in hell What's holding you back is the mobile HD4200. It's a pretty crap GPU.gameguy6700

On the contrary; it's fast in comparison to most IGP's. The OP should be able to pull off medium settings on most (if not all) Source based games, though I'm not entirely sure how well it'll hold up on the other titles listed.