Power limit is "power control settings" in CCC i assume? are we tallking + or - 20? changing these does nothing for my gigabyte 7970, currently peaking at a measly 536khash. also ANY memory overclocking at the piece of shit dies.  any thoughts? could it be overheating? can i change the point at which it kills itself in terms of heat?  im starting to think this card is shit - here are my essentials -

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1


cgminer --scrypt -o http://xxxxxxxxx -u xxxxxxx -p xxxxxxx --shaders 2048 --intensity 13 --worksize 256 --thread-concurrency 8192 -g 1

g2 makes no difference.  higher thread concurrency kills khash to ~200.

Also, would one need to RESTART cgminer for changes to take effect? it seems even when i do OC the mem, nothing happens there and then, other than, of course, my computer dying.