Thanks for all the responses. It looks like 12.4 is the last one that supports CAL/Brook+. Do I have that right?
But I am still not clear on the other question. Will 7970 crunch CAL/Brook+ apps at all, regardless of the driver version? I am thinking the answer is NO, based on some of the links to Slicker posts. Also, based on the fact that 7970s still don't work on Moo. But I can't tell for sure.