mining on mobo with onboard GPU
I'm new to all of this, so bear with me.
I have a Gigabyte GA-A75M-S2V mobo, with an onboard GPU/APU, and dual PCI-E slots, running Win7.
Is it possible to install a video card in one/both of the pci-e slots to mine on, and leave the onboard GPU for the main monitor outputs? I put in an ancient 6800XT, and while Win7 saw it, cgminer didn't?
This is the computer I use for my office type work, so I can't bump up the intensity and have the desktop be sluggish (like I've already noticed during testing). Or, am I better off just making a dedicated mining rig?