Killzone developer 'PS4 has no performance bottlenecks'

[HoloDust]

Here's a good example of a performance bottleneck on HD5550 cards caused by memory bandwidth:

HD5550 (GDDR5; 51.2GB/s) = 1.24x HD5550 (DDR3; 21.6GB/s) = 1.32x HD5550 (DDR2; 12.8GB/s)

Core clock and bus width are same for all cards, so slower memory subsystem is causing bottleneck when it's used, not allowing GPU to perform anywhere near its full potential.