Lo, this MONSTER!
Ever wonder how upgrading your gfx card will affect your 3d rendering ability in Hammer 4
The answer is: Big-time!
Definitely noticed a general performance increase after getting a rig with an i7 processor, but since I didn't map much at the time, I can't be sure to what extent.
Now, after upgrading my gfx card(from GTX 630 to a GTX 650), the 3D performance increase is unmistakable! Before, I'd have to visgroup like a bandit just to have smooth 3D navigation on a big map, but now, I can have the entire map visible while editing, with no choppiness, nor any sort of lag!
If you were thinking about upgrading your gfx card and you map a lot, hesitate no further!* *For Hammer 4 at least. i have yet to do any testing with Hammer 3.x