Remove the crossfire connectors
CGMiner 2.11.4
Windows 7 Ultimate x64
Catalyst 13.3 with included SDK
MSI Afterburner 3.0.0 Beta 8 (Easily allows unofficial overclocking)
Im running the same now.. besides Win 7 home prem
cgminer.exe --scrypt -o http://ltc.nushor.net:8998 -u scape373.1 -p x -g 2 -I 13 --shaders 2048 -w 256
But im getting massive HW errors.. Meh...
http://gyazo.com/d284e27b57b5e1f3b76bcb2b52275f6a.pngSetup afterburner as such:

Set your clocks, close afterburner, and CCC. Leaving afterburner open for me causes the hash rate to immediately drop and cause weird GPU usage issues. Open cgminer folder, delete config file, and scrypt binary file. The binary file will be named something like: scrypt130302Tahitiglg2tc10240w256l4.bin . Start cgminer with the command line you used above:
cgminer.exe --scrypt -o http://ltc.nushor.net:8998 -u scape373.1 -p x -g 2 -I 13 --shaders 2048 -w 256
Press S and W to write a new config file. Close cgminer, open the new config, and edit it for your pool information, fan settings, etc... I've done this with 3 rigs, that each use different GPUs, motherboards, etc... and all of the 7970s, but one get 720 KH/S. The one that doesn't overheats so I have it turned down to 550 KH/s. I've also used the same method on 4x Tahiti based 7870s, but they are a little whacky.
EDIT: My desktop I am using now:

GPU1 is my display card and I turn it down sometimes depending on what I am doing.