My cgminer settings for my 7850 are:
--gpu-fan 0-75 -w 256 -v 1 -I 13 -g 1 --thread-concurrency 8192 --temp-cutoff 90 --gpu-engine 850 --gpu-memclock 1208 --lookup-gap 2
I get 268 Kh/s in scrypt with that but only 188 MH/s in SHA 256 (ppc and trc)
Gui Miner with flags "-v -w256" gives me 240 Mh/s
How do I mine PPCoin/SHA crypto currencies at a higher speed (while still desktop usable) ?
Are there PPC pools with irc channels that can help with configurations? Guys in the give-me-ltc pool helped me tweak my settings for scrypt.
I'd imagine the differences you're experiencing are caused by the downclock of the gpu engine and increase of memclock (works great for ltc, gpu engine needs to be changed back for btc, and you can downclock memclock). try removing those two flags for btc/ppc mining and let us know.