That depends on the resolution. Lower resolution and you're correct. Higher and you need more memory. You notice this with the benchmarks with 680 @2gigs onboard vs 7970 @3gigs, the 7970 does better at higher the resolution vs the 680.The 7970 has 3gb of GDDR5. My 680 has 2gb of ram and it's the same speed as the 7970. The 680 with 4gb is barely faster than the 680 with 2gb. The amount of ram is not what counts for a GPU.8GB "GDDR5"? The GeForce Titan only has 6GB. This thing could blow all gaming PCs out of the water.