I Do not know what you guys have got I think mine as 8GB Vram But best software I use is RamDisk it partitions your memory into a virtual SSD Hard Drive apparently its like having 100ssd.s ,,, My PC Saves 2048x2048 textures faster than you can scratch your nose
Check this RamDisk out if you have not already got it,,,,9000mbps ,,,,,,,
I Do not know with the Games m8,,,,,,,A ram disk only helped my games with the loading times. This game loads most of the round before you do the race your running, so I don't think it would help. The fps would be depending on your gpu and cpu. The only way to get more fps would to get a better gpu or cpu that I know of. I tried the ram disk with this game and 2012 and didn't help the game play at all.