Sam
Since you are doing some benchies, also try this:
1) Run Catalyst 12.1 installer -> Custom install -> Unselect All button -> Select GPU Driver only -> Next... Untill it's installed
2) Run Catalyst 11.11 installer -> Custom install -> Unselect All button -> Select SDK Runtime only -> Next... Untill it's installed
3) Done!
That should give you a driver without the 100% CPU bug and the last version of SDK 2.5 runtime.
That's kind of my plan. I'm tinkering with 11.9 now and will then go to 11.11 and 12.1 per yours and others suggestions. I want to do some testing of my own before I settle on the combination you suggest.
Is the SDK 2.5 in 11.11 differenet/better than what shipped with 11.9?
I'm still perplexed that 11.6 has 100% utilization on Win7 but not on WinXP. I guess I'll have to let that one go
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Thanks,
Sam