nVidia inspector setting vs XP's

I’ve been playing with XP rendering settings and also nVidia’s with the sole purpose of finding the sweet spot for my not so fast/old pc.

Now, I love HDR but with my gtx560Ti 448 at 4x SSAA + FXAA just can’t handle it and in 2X it just doesn’t cut it, too much shimmering, I also like RW and unfortunately if there are any clouds HDR will kill performance.

So I stared to fiddle with nvidia inspector settings and after quite a bit of testing it came down to the following options:

These settings yield all around best performance/quality ratio with RW and no drop in performance when in clouds and a steady 30 fps in my system. Of course if I get into big airports like Chicagos's Ohare, well thats a different story as my Phenom X4 o/c @ 4.1 just can't handle the autogen volume even if set at Tons (22 fps), so I only fly into small to medium size airports.