How come I run Thief so poorly?

1N07

Distinguished
Feb 26, 2014
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I have:

FX-8350
Gigabyte GTX770
8Gb RAM

yet, I can't even run it on 1680 x 1050 resolution High settings with all AA SSA FXAA things turned off or as close to off as they can be.

Also, I should probably mention that there seemed to be almost no FPS difference between High and Very high. I don't know what the hell is going on...

UPDATE:
Just did some more testing. It lags even on normal settings with all the AA settings off or as close to off as can be. There seemed to be only a slight FPS difference between normal and very high settings. My drivers are up to date.

UPDATE: I did some light OC'ing. Now I can run it on 1680 x 1050 High settings with FXAA=off, SSA=low, texture filtering quality=default, Vsync=Double buffer. I'm going to try turning Vsync off just to see how much that effects FPS and graphic quality.

But still... I'm wondering what's wrong... I've seen people run this on Ultra 1080p on GTX770 with no problems.