I installed GTA V recently, I went to change graphical settings, but it said it only had 512 mb of vram, I brushed it aside thinking that my gpu really was that bad (I have a 10 year old hp prebuilt that is supposed to use an HD 4200). Then I found out that I had a Sapphire ATI HD 5570 - with 2gb of VRAM, so now I'm wondering why it's not showing up.