If I had to choose, I would go with the Armor OC. The extra 4gb of VRAM will make future games (which will propbably be more VRAM hungry) easier to run. Now many people say the quality of the Gaming X cards are higher than that of the Armor cards. I have used both in the past and as far as I can see, there was no real difference in noise or thermals. I would choose the Armor OC, strictly because of it's higher amount of VRAM.