You can clean install (use DDU) any past, present or future driver you want anytime.
14.1 catalyst driver is not a whql/ signed by microsoft tech guys driver, and may be stable for the guy but that doesn't mean the same for me or you.
Same goes for all drivers. Some people and some games benefit from latest drivers, others don't. And it's the same with driver or game issues as well.
You cam check if a driver is whql with gpuz or type "dxdiag" on windows search and run the diagnostic.
Latest beta drivers usually have more optimizations, especially for the latest games, mind you.
Link to latest WHQL and BETA drivers (64bit) from AMD Official Site:
Link to previous WHQL AMD Catalyst Drivers:
If you want additional previous beta drivers, search on good sites like Guru3d.com
Make sure you reduce any oc, that your gpu temps are good (65-78° C during game load) and do not force/ override aa.
Test some drivers and temporarily stick with the one that works for you.
gigabyte X58A-UD3R rev.2, core i7 975 3.9ghz (stock voltage), windows 8.1 64-bit, corsair 12gb DDR3 1600mhz 7-7-7-20 RAM, sapphire HD 6990 (stock clocks), coolermaster ultimate 900w PSU.
amd catalyst 14.6 RC2 june23