Hi all
Just wanted to share my experience setting up my 7970 vapor-x ghz edition cards. Couldn't get more that 550Kh/s out of them initially and even flashing the bios as recommended here:
https://litecointalk.org/index.php?topic=2963.0 Did not seem to help. After much messing about once I upgraded the CAtalayst and the SDK to 13.11b and 2.9 respectively it sorted me out. Now I'm getting 730Kh/s stable at 1.1v undervolted with the dual-x oc bios edited with VBE7.
They run super quiet and super cool.
http://s2.postimg.org/skald9o7d/7970_proof.jpgimage url uploadSweet as a nut.
Much Receive: DPL6fXqDwzMqXgawJWB8DwRouXktw2B1sZ