Full config with one 6950@6970 :
x11 = 195w
khc = 240w
stop killing your gpus!!! running full voltage???
280x
x11 6.5mhs 144W
khc 151khs 137W
Neoscrypt 325khs 157W
Lol.
You have values with your hardware, i have values with mine.
On MY config with 1 6950 with shaders unlocked, I have :
x11 : @850/1300, ~1.9MHs, ~190w
khc : @825/1200, ~110kHs, ~240w
neoscrypt : @875/1300, ~6khs, ~165w
Compare what it can be !
EDIT : on idle, full config is at ~90w ...
You can likely lower the power usage and definitely the temps by underclocking the mem clock. With this algo it doesn't seem to need a high mem clock like scrypt. I have the mem clock set to under 400mhz on all of my rigs with no loss of kH.
Latest omega driver will tolerate no lower than 750 memclock in CCC on a 280x, noted that in GPU-Z the clock goes right to 1500mhz as soon as cgminer is launched even if overridden in CCC overdrive. How are you doing this?