Im set on a 2012 MBP 13 or refurb MBP 15 with 512 vram I know the 4000 is way faster than the 3000, but how much more power will I get out of the 512 vram over the intel 4000? I do not really do much that requires a dedicated GPU, only games I play are ROMS and I do not edit videos. The most labor intensive programs I use are logic and aperture. I do not need the GPU or quad core but do like the larger screen. Any input?