A10??! Not on the PC, shirley?
Falcon 4 is though 🙂
If you can’t run Doom smoothly in 1024*768 you probably have a weak video card/integrated. BeB is prettymuch right on (no surprises there) with the RX recommendation, however you can also buy a lot of old games for the price of even a basic video card….
I also suggest BioShock, it’s ace. Probably runs well with a vaguely recent GPU.
Command and Conquer – boxset isn’t dear in CEX/ebay. Runs on a potato.
Dead Space – ****** scary. Needs a little GPU grunt.
Marathon/Aleph One – before Halo there was Marathon, Bungie were really really good back then 😀 More likely to have compatibility issues than hardware ones!
Fallout 3 – scales well. Min Spec: Geforce 6800/ATI* x850
Unreal Tournament/Quake – you can still get pwnd online 😛
*sigh…those were the days…