Since you chose NOT to identify the graphics solution, no one can answer. This doesn't cut it at all: "ATI display adapter (0x9712) video card which has 1.9gb video ram, it has 3d and hardware T&L, pixel shader version 4.0 and vertex shader version 4.0 which apparently is good enough to play fallout 3."
It would be entirely possible to hang 2 GBs of really cheap VRAM onto a very cheap HD 5450 and charge twice what it's worth, because noobs will believe anything, including that the large RAM amounts mean something.
Incidentally, the VRAM actually attached, if any, is irrelevant beyond 512 MBs in this game.