It looks like the GTS 250 is getting a really good full device support from everything, .. . much better than the earlier capture of the 9200 type card.
I did try with and without crossfireX enabled, and I seem to get the same "Lack of the checkbox in GPU-z" while GPU Caps shows it as working and also lets the demos run in GPU mode.
I did read somewhere that any ATI card beneath the number 48xx is not supposed to be supported, but my Sapphire HD4770 do it fine.
I guess it might even be that I might have some bug in my PC that is just preventing my HD4770 from not showing up in GPU-Z while still working in the other software, as my last clean install of Vista64 was months ago.
Perhaps other users of HD4770 can try installing the SDK kit, and then let us know later if they get the GPU-Z checkbox to appear checked.
All in all. . .. I really am happy with using my 2x4770 setup on this vista 64 setup. . . and am starting to buy parts for my EVGA 780i motherboard, so I can have a good gaming backup. Just need to get a CPU and Mem, i still got an 8800GT to start off with, so it may not take long.
I do have an Acer Revo 1600 for doing the Media playing while I game, but that is still so new for me that have not really been using it for much else other than playing Video or Audio, or as a browser so i don't have to stop my gaming. .. . . . lol . . .. lazy me . . ! .. . . it was so cheap i couldn't resist gettin it at 179.. . .and seems to work better than I had hoped for too.
Ahh . . .. ranting again . . I will update this thread if I ever do find the checkbox checked though.