1. No this would most likely make it slower. The problem is CPU usage not I/O transfer rate here and USB is slower then SATA. 2. I don't know of a sub 100 dollar one, the Avermedia Elgato is extremely popular but Amazon has it listed for $135.00 right now. However unless you're offloading the encoding to another computer this will not help you. So what I mean is you'd need to run Rocksmith on one computer, and have the Capture Card connected to another PC that was actually doing the encoding that would be connected to video out on the first PC. I use OBS, if you don't it's completely free if you want to try it, and there's possibly a medium you can come to with video and audio quality and the specs of your PC, look around the forums. Not knowing the specs of said PC I really don't know for sure though.