i am using GUIminer with my 7990 and keep getting a "problem communicating" error every 3-5 minutes interval. Anyone know why and how to fix it please let me know.....my hashrate drops from 500GH/s to 100KH/s when this happens....
horosho
Try CGminer instead, and check the intensity level.
You can download cgminer here...
http://ck.kolivas.org/apps/cgminer/The latest version 3.2.2 was released just a few days ago...
Let me know if that helps...