RAM is one factor that determines how quickly an Android headunit operates. More RAM means more apps or more of the app can be kept in RAM for quick access, say, for switching between navigation and streaming. More RAM means a more fluid experience.
The early fakes had a miserly 1 GB of RAM, which left only 762 Mb for the user to load apps after Android had used its share. The Chinese fakers edited the files that report the RAM level to show they had 2 GB RAM worth of chips fitted.
UIS7862 6 Gb
As newer processors are designed for Android headunits, the designers include the ability to access more RAM so that the mainboard designers can specify a higher amount of RAM. The UIS7862 SoC can access a maximum 6Gb of RAM.
Extra RAM chips, DIMM slots, SODIMM RAM and DDR RAM, are all often upgradable on a PC or laptop by removing the cover and operating a few clips. Removing the lower capacity RAM modules and replacing them with higher capacity RAM chips or filling an empty RAM slot with a stick of RAM are all options, but not for the Android headunit.
Although the Android headunit may look like a mini PC, it is much more akin to a phone. You can’t upgrade the RAM in your phone; you buy a more modern phone when your current one gets ‘slow.’