Hello I have alienware m17x r2 i7 quad i940xm with mobility radeon 5870 crossfire(2X 1GB).When i go to dxdiag it says i have only 712 approx total memory when i shall have atleast 2 GB and when i go to Can i run it t check if i can runsome games and i search for ARMA 2 it says that i cant play it because my Vram is below recommended.I run Arma But even on low Graphics i can play it only on 25-40 fps.I have thedell drivers frmy alienware. in 3dmark vantage i score 19000 which is ormal for my pc. Please help f there is a wa t increase my approx vram.
use gpu-z and you will see how much vram you really have. dx is probably showing bogus number like currently used vram or so. anyway i believe that cf is like sli so that in case of cf and 2 cards with 1gb vram only 1gb vram is actually used, other 1gb (prob on secondary card) is left unused