I'm new to mining and the reading I had done had me under the impression that the graphics card was the dominant factor in determining what you could get out of your rig. However, I started with getting about 400 kH/s with the XFX R9 270 on my work/gaming machine, and then decided to try to stick some XFX 7950s into a crappy rig with a Celeron, cheap Gigabyte mobo and cheap memory, and it is giving me almost nothing. If I take the 7950 and put it in my "good" machine, I can get about 530 kH/s stably without touching other options; in my cheap rig, I get about 150 from the exact same card before it explodes with HW errors. With overclocking, I can get my good machine to do about 630 kH/s with that card before I start getting occasional (~2%) rejections (still no hardware errors).
Am I doing something wrong, or did I just pick some bad components for the rest of the rig?
What miner are you using and are the configurations the same?
