12.11:
13.2:
http://techreport.com/review/24218/a-driver-update-to-reduce-radeon-frame-times

13.2:

Well that was quick.AMD appears to be making good on its promise to address frame latency issues via driver updates. Andrew Dodd, AMD's Catalyst guru, tells us a variant of the Catalyst 13.2 beta driver we tested will be released via AMD's website next week. That should be a nice first step toward shoring up Radeon performance compared to the competition
http://techreport.com/review/24218/a-driver-update-to-reduce-radeon-frame-times