bandwidth/speed is not what affects gaming performance, but rather latencies; True latencies. Having much faster RAM is no good for gaming if it comes with proportionately higher CAS latencies to keep it stable. Even with properly "fast" RAM, you will only really see any meaningful performance gains in CPU bound situations, which most games are usually not CPU bound. in such GPU bound situations you will see minimal performance gains and usually only to your minimum framerates. on the other hand, in a properly CPU bound scenario we tend to see significantly better performance scaling to a noticeable extent.