I installed this
And visually notice very little difference aside from the fact that the game is steadily running at 40+ fps. GPU benchmark yields 42fps @ 1680X1050.
All my ssao and hdr, ultra quality water, all the DX10 effects, etc... I'm running the quality version of the mod.
So those of you who haven't tried this yet, I HIGHLY recommend it. Beats HP and natural mod hands down.