So I'm obviously a newb but I love the concept of Bitcoin and I am really into programming/networking so I've been dabbling around mining and stuff to see what this is all about. My question is, with CG Miner, can I throw old GPU's into my extra PCI-E slots and run separate workers/CG Miner's on them? If so please explain how unless it's just that simple 
If not, could this be done with a different miner or something? Thanks!
-Jet
If not, could this be done with a different miner or something? Thanks!-Jet
With CGminer you can set different settings for each individual GPU so you don't need to have separate instances running. The older GPU's you want to use need to have OpenCL support (AMD/ATI HD4000 series or newer)