Hi,

I think i've read about this problem before but i can't find any info on it (Searched google and this forum)

I have 4 x Gigabyte 7950's, just set up an hour ago, installed windows, and the 13.4 drivers.  I will use cgminer in the end, but using GUIMiner for now just to get it going. 

3 cards are doing fine - 500MH/s, but the 4th isn't doing anything - it won't accept shares.

Am i missing something obvious?

Cheers.