I actually turned vsync back on just to get rid of the mouse lag, and now have very smooth gameplay at 75 FPS in menus and 25 FPS in all but very heavy action at 1280x960@75hz.
I also turned off full scene glare, and light streaks, (or wth it's called), just from my racing sim days learning when I switched to ATI that this type of effect was CPU and GPU crippling when rendering 43 high-res cars.
NV used to be crippled by AA at about the same rate as ATI was by lighting effects.
I don't know exactly how much progress has been made in these areas on the newer cards, but I'm very happy to be running the sim at all on my old 9800Pro 128MB.
I also loosened my ram timings slightly and OC'd my little pressie 2.8 to a little over 3G, (use extreme cooling and caution if OC'ing).
I could write a novel of settings and tweaks, but there are plenty of capable gents here that I'm sure will chime in with some more helpful hints.
I hope a little something in this post helps you guys!
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