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Dirt 2 maybe? Well I've played that game on XP with direct-X 9 and also played it on W7 with direct-X 11. I can see no (noticeable) difference whatsoever. Take a look here for a side-by-side direct-X 9 / direct-X 11 comparison which mirrors my own experience of playing this game on both Direct-Xs. If anything, direct-X9 looks better!
Codemasters delayed the PC version of Colin McRae Dirt 2 in order to upgrade the Ego Engine of the racing game with DirectX 11 "support" (just like every other "direct-X 11" game ...support only, not written for).
I only recently upgraded my card (9800GT 1GB) because the fan was annoying me after years of use. I went for a Gigabyte GTS 450 OC (supports direct-X11) because I managed to get it for $109 and it is "silent" unless under load. I would have kept my old card and just bought a cooler with a silent fan if I hadn't been sucked in by the direct-X "hype" hoping for something special with a new graphical experience. Not so.
Cheers,
Lee
