I know this may have been asked and answered already, but I couldn't find anything and my post got lost in the newbie forum. Please don't hate me if I did miss something or completely misunderstood the FAQ's.

I'm running a GTX 670; yeah I know NVIDIA, but I make a super small profit and I got it for gaming. I see this as more of a hobby or something like folding@home, but can make some money off of. OK, getting back on topic, no matter what driver I use (tried ~4) I can't get the CPU usage in Linux to drop from 100%. I wanted to know what if there was a particular driver that works well or something. Also, I don't quite understand the whole kernel thing for cgminer, so my next question is, is there a kernel that is better suited to a NVIDIA card like mine? I noticed there are suggestions for ATI, so I'm just throwing it out there.