512MB vs 1GB VRAM: Difference in watching HD Movies?

Hi. I am planning to buy a 2012 15" MBP Non-Retina/High-Res (Anti-glare). I cannot decide between the 512MB vs 1GB VRAM model.

My MBP MUST be able to play HD Movies (1080p & 720p) very smoothly. In addition, I would like the to possibly do photoshop editing. However, this is not important to me - it is just something that I would like the laptop to do possibly in the future. Please note that I do ***NOT*** do ANY type of gaming or video editing.

Should I just go with the 512MB VRAM or will 1GB VRAM make a difference for my needs?