Default vRAM of Ryzen 5 2400G and How to increase it?

Nov 17, 2018
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Hey there..
I just bought ryzen 5 2400G..
Motherboard is Asrock b450m HDV.

FYI it has vega 11 igpu,which relies on system ram as it doesnt have own ram..

Now my question is, how much vRAM i am gonna have by default??

And if i want to increase or decrease that? How do i do that?