Thief, while not one of the best reviewed games of recent years, is certainly one of the best looking. Its grimy streets and dark atmosphere are all created using the popular Unreal Engine 3 with a few tweaks here and there, making it a good test of contemporary hardware.
The built-in benchmark was run with all settings on low, with a resolution of 1920 x 1080. While we would have liked to have run tests at native resolution, these settings were the only ones that didn't result in sub 10 minimum-FPS.
While not necessarily smooth, it's possible that you could play Thief at these settings. You can lower the resolution for some improvements to the FPS too, but the distance from the native resolution at that point starts to cause its own problems.
This Dell XPS is so cool