I recently inherited an HP Pavilion from my grandfather. The sticker on the computer said it was model 595-p0074, i5 8400, 12gb ram. I haven't built a computer in about 20yrs but i figured i could take out the cpu, ram, and drives to make a decent gaming pc. When i opened it today i found one stick of 8gb ram and an amd ryzen 3. . Im assuming my grandfather was taken advantage of? It's never been opened since he bought it. Can i still make a decent gaming computer with this cpu? Thanks