I just downloaded and installed 13.8 beta8 and my 3dmark 11 score on my 7990 went from 19600 to 21600 something...
This driver is good, but in BF4 game my HD 7990 have big drooping in Performance .earlier i was use 13.10 beta2 and the Performance was very good but there was a problem in crashing bug.

13.10 beta2: Performance was very good with BF4 + crashing bug
13.11 beta8: big drooping in Performance with BF4 + fix crashing bug

It seems that AMD can't fix the two thing together.