2x7970 freeze windows and linux too

[mastercracker]

Hello to all.
I just upgraded my machine to 2x7970 .Both of them is Gigabyte, one is GHz edition and the 2nd one is standard. The problem is when I run some test etc my computer freeze. I try with standard clock,overclocked blablabla...same....

Maybe some help ?
BTW I use Catalyst 12.8 (in windows 7 64bit and in linux ubuntu 64bit too).

Try reducing your -n to see if it helps avoiding the crashes. Also, when does it crash? What was the command line and algorithm used? Other than that make sure that you have a good enough PSU for your 2 cards. For Windows, there is also a patch that could help:
http://hashcat.net/wiki/doku.php?id=timeout_patch