Yes. A dual core will struggle in games that require 4 cores. (Witcher 3, GTA 5, Far Cry...) the 4 or 8gb vram doesn't make any difference. What is your fps goal? If you just want 60fps, you can just get an i3. That will give you close to 60 fps in almost any game(in the high 40s in gta 5). But will still slightly bottleneck the 480. An i5 would be ideal. You can still get the 480 and upgrade later.