Bought a used desktop yesterday, cpu is AMD Ryzen 3.5 GHz, motherboard is Asrock (according to the initial welcome splash screen after it boots). Not 100% sure as vendor could have rigged it that way, though. Only mobo markings say CF-AF3-EV18 but google says that is the BIOS. There is a small decal on the mobo, says CA68HM-K. Googling that says it is an Asus but web pics of that model are different from the actual mobo installed in the case. Anyway, It runs Win10 Enterprise. Problem is it has 8gb RAM but Windows system info says only 4gb is useable. I am not sure if that is a BIOS limitation, but anyone know of a fix? The unit is only 2 or 3 years old.