A:AnswerYou could upgrade the processor and add ram if you wanted. I am not sure and am not an expert, but any processor fitting the LGA1151 socket should work. It comes with an i5-7400 I believe, so you might be able to go up to an i7-xxxx. Adding ram is pretty easy if there is an empty slot. You could also drop in a faster, newer video card. Finally, and where I would start, is replacing the hard drive with an SSD--everything will load much faster. In stock form, I don't see why you can't stream from it while playing games now. What problems are you experiencing?
A:AnswerThis is not a high end pc so you will not see a list of games that say min/high requirements.
This will show you some games of a similar pc https://www.youtube.com/watch?v=B6Ijym8d9NA
You will bascially get 60fps on 1080p in the games you play medium to high.
A:AnswerUsing CPU-Z, my system shows a single stick of Micron Technology DDR4-2666 (1333 MHz) #8ATF1G64AZ-2G6H1, single channel in slot #2. The actual DRAM frequency runs around 1200 MHz with a CAS latency of 17. The NB frequency runs around 3196 MHz.