Handheld gaming PCs

How do the main handheld gaming PCs compare on screen, battery, weight and chip?

Seven named models from Valve, ASUS, Lenovo and MSI, in their base configuration. Values come from the maker's own pages, or a dated public copy of one where the maker blocks our bot, and only where the page ties the value to that exact model. Not yet a complete list of handhelds on sale.