All depends on what you are playing, your're internet speeds *upstream mostly, you can use NVENC or X264, because you are i5 and playing something same time I assume, you will probably not want to use x264, it's higher quality a smidge, but a big hit in resources, wheras NVENC is built into the GPU and will greatly reduce usage of resources and will make streaming a lot easier on your PC. with NVENC you could do 1080P/60FPS no problem, but again depends on what you are streaming etc. If streaming to twitch the max CBR is 6000, 720P/60FPS looks pretty good under NVENC at 6000, give it a try, Keyframe interval needs to be 2 for Twitch. But without knowing if your connection is good or not, I can't say how well it will go.