The Pentium has an RX 460. The RX 460 is the discrete GPU. The i5 has no discrete GPU. With the i5 system, you would have to use the iGPU(integrated graphics) on the i5, which is nowhere near as powerful as a discrete GPU, like the RX 460 or GTX 1050. So if you want to do any kind of gaming, you're going to want to get the Pentium and RX 460/GTX 1050. If you get the i5, you'll probably want to add a discrete GPU like an RX 460 or GTX 1050 asap, so you can actually play games at decent settings and FPS.