My GPU HD7970 OC 3Gb by sapphire
since I have installed the latest beta drivers (15.5) with win7 64bits I have experienced some stuttering problems with GTA V. And I have found that the game does not recognize my vram quantity and give me 836Gb of vram and if I try to put default parameters the game set to low. (The game probably try to use more than 3Gb of vram because he does not recognize my vram and give me stuttering when the vram is overloaded)
When I reinstall the 15.4 drivers the problem disapear, the game give me back 3072mb of vram and the default parameters is set to very high.
Anyone help ?