A:Answer I don't know the "generation" of the 8GB stick that came in the system, but I added an 8GB stick of Crucial DDR4 2400 (PC4-19200) RAM without any issues at all. I purchased the RAM from NewEgg on 1/5/2020.
I also managed to get an EVGA GeForce GTX 1660 BLACK GAMING Video Card, 06G-P4-1160-KR video card in the system and it's working well too. When I get a chance, I'll run CPU-Z to see what info I can get on the RAM that came with the system.