I'm new to this, and i don't know a much about mining. But is it possible to mine with both cudaminer and cgminer simultaneously on two different cards? is it even possible to run an amd and nvidia card at the same time? i'm asking because i already have a gtx780 hitting 550 KH/s running cudaminer, and i have aquired a R9 280x cheap from a friend. i don't have the money yet to make an entire new rig for mining, so this could be a great way of optimizing my available hardware if it's possible .