What do you mean underpowered? Are we talking current, as in AC/DC?
It handles 6x antialiasing quite ok in halflife2 source. This is the computer of my step son. He says it used to work, but suddenly most all textures have gone bad.
I put my older msi nvidia ti4200 card into his computer. Directx 8.0. Running halflife2 quite ok. No texture problems. It need to be said that if he run dx 8.0 on his own card, it works flawlessly to. Is there something with this card?
By the way. I have almost exactly the same computer as you have, AtaruMoroboshi18. Not quite as fast video card though. Running Ubuntu Gnu/Linux amd 64 bit version. 😉