I just filed a bug report with AMD about this long standing and serious (can cause system instability) issue: So far all drivers from 13.4 as well as all subsequent beta drivers are affected (haven't tried anything earlier than that, I just recently switched to AMD from Nvidia). Only Adobe's official Flash Plugin (in Firefox or Internet Explorer, including the one with the Windows 8's native plugin) causes this driver bug to occur but not Google Chrome's integrated Flash. While Adobe may be responsible for triggering it, this is clearly a driver issue - no software or plugin should be able to randomly adjust clock speeds, especially without UAC/admin rights! I know this can be reproduced on other systems with Windows 8 and HD 7850/7870 (Pitcairn). I'd like to know if any of you can reproduce this on other Radeon cards, other Windows versions as well as single or triple monitor setups.