Behold the gorgeous ACEMAGIC Retro X5 system, which hides an AMD Ryzen AI 9 HX 370, 32GB DDR5 and a 1TB NVMe SSD, with a second empty M.2 slot all inside a shell that resembles the old NES case, sans cartridge slot.  The Retro X5 offers all the modern conveniences of USB-C, Wi-Fi 7, Bluetooth 5.4, dual Ethernet, HDMI, and DisplayPort.  The case is not sealed, you can open it to add components as you desire which makes the Retro x5 even more attractive as a SFF PC.  You won’t be able to squeeze a GPU in there though, you will have to depend on the 16 CUs on the AMD Radeon 890M.

Guru3D put the Retro X5 through it’s paces and the cooling system ACEMAGIC used keeps the HX 370 from thermal throttling, though it does run at a quite toasty 95C under full load.  You could try blowing on it to get better performance, but there are no guarantees that will work as well as it did on NES cartridges back in the day.