Just slightly off topic but what settings - if i may ask 
- are you using for the Sapphire 7950s? The one in my rig is running at an avg of 603 kh/s, getting it to 630 would be nice. Currently I am using cgminer with
shaders = 1792
intensity = 20
engine = 1075
memory = 1500
w = 256
thread-concurrency = 25088
lookup-gap = 2
threads = 1
auto-fan
and nothing else. I experimented for a day or two with all sorts of settings but this was the fastest I could come up with. Have I missed something or is it just my card? The model I am using is
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202026
EDIT
Just found a tip somewhere else on the forums here - enabling powetune +20 effectively turns it off and stops the cards from trying to save power. it increased my hashrate from 603 kh/s to an avg of around 635 kh/s - thanks roy7 for that tip.
- are you using for the Sapphire 7950s? The one in my rig is running at an avg of 603 kh/s, getting it to 630 would be nice. Currently I am using cgminer withshaders = 1792
intensity = 20
engine = 1075
memory = 1500
w = 256
thread-concurrency = 25088
lookup-gap = 2
threads = 1
auto-fan
and nothing else. I experimented for a day or two with all sorts of settings but this was the fastest I could come up with. Have I missed something or is it just my card? The model I am using is
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202026
EDIT
Just found a tip somewhere else on the forums here - enabling powetune +20 effectively turns it off and stops the cards from trying to save power. it increased my hashrate from 603 kh/s to an avg of around 635 kh/s - thanks roy7 for that tip.
I am currently mining bitcoin/sha256 and my memory is underclocked so can't really tell for litecoin. However in cgminer my settings are -I 13 -w 256. The cards are stable at 1200 core 300 memory (no crossfire) and for power GPU-Z is showing:
vddc 1.156 with peaks to 1.163
cddc current ~56 A
vddc power ~67 W
temp - from 64 to 70 top but they are not in case
Can also post a screen shot. The GPU is Sapphire with Boost @925 core stock and device ID 1002-679-A (can post link to the Sapphire site, but I am not sure if this will be violation of the forum rules).
Originally I also tested overclocking the memory and it reached about 1550 MHz stable with 1200 core so they should be good for LTC as well. I am just mining BTC at the moment as had some issues with CGMiner and windows.
Hope this helps.