No one at give-me-btc could help. Who knows this stuff

[hercules71185]

I was using guiminer, I have in the current rig I'm talking about 3 AMD radeon 7970s. Each card hits 540khash. People with the 7950 are hitting 650. I've literally tweaked my cards from 400mhz to 1300mhz and everything between. My memory from 1400-1700. Nothing. I've had my bat file tweaked. I've spent hours tweaking it myself. My lowest results are from 400khash, highest 540. The only time it has ever went below 520 with ANY of the 100s of settings, was when I enable 2 threads. If I use 1 I'm golden. I've enabled and disabled crossfire. That changed nothing for me. What is going on? I'm irritated and I have so much more stuff to tweak and get online.

[lmotaku]

I'm not sure, I haven't had really good experiences with the gui-based miners either, except for 50Miner, which I know doesn't work for you.
I have tried Cgminer on two different computers (Ubuntu 12.10, Ati Radeon HD 5570, and my Windows 7 desktop, Radeon HD 7750)(Which you already know of.)

I pushed my 7750 all the way to 1024Mhz+ and got a really good hash rate(For this particular card anyways) of 181kH/s. Via windows my 5570 struggled over 50kH/s, over linux it's been running the last day or so at 80-ish kH/s.

Things I didn't mention to you yet on Skype: I can push my card/s harder with Cgminer by fine tweaking the voltage and power tune, knowing the limits of the card and acceptable settings.
For example, I pushed the 7750 to 1.064 voltage, 1100Mhz, Powertune +10%, Memory 900mhz, and tapped out at 210kH/s~ but literally made my desktop unstable. Since my desktop isn't a dedicated miner, I just couldn't leave it that high. Stock I get like 140kH/s using 14 intensity. You should take this into consideration if you haven't. If my experiences don't help you at all, it's pretty much as always that for some reason different miners seem to work differently between the two of us, haha.