I don't know...the K6 will probably limit the video cards, so I don't know, the performance will probably be similar. Stability is like a toss up, most say Radeons aren't as compatible, but some say the opposite. Though you may want to look into the MX's power consumption and if your board can handle it, I've heard of a few that couldn't get Geforce MX's to run on some boards because of that.