lol Just disable that vpu warning message, from what ive been reading the 4.10 has a couple of problems, most people have rolled back to the 4.9 or the 4.11 beta, driver 8.07 with the ram fix.
http://www2.ati.com/drivers/hotfix/wxp- ... 18380E.exe
ANother thing may be overheating, possible the gpu isn't making proper contact with the heatsink. Download this
http://www.daionet.gr.jp/~masa/archives ... bl_1_2.zip extract and run it in windowed mode, before running it open the ati control panel on the temperature option, move it so you can see it and watch what the temp climbs to after 5 mins of running that demo.