How do Shared Video memory actually works

chocopasa99

Prominent
Jan 6, 2018
11
0
510
I have an Apu a4 4000, the integrated "gpu" that comes with uses ram as video memory if i'm not wrong, so i have 4gb ram but 3 usable due to this, however i entered bios and changed the alocated vram to 1gb, obviously my ram lowered but i gain some fps on some games, BUT i changed it back and i set it to minimum 32 mb, so now i can 4gb entirely, so i opened a game expecting the lowest fps but they remained the same i think even higher than before and game also feel more fluid, so how does exactly this works? https://ibb.co/bzCFjx