GeForce GTX 570. Is memory overclocking necessary?

Not so long ago, our laboratory have received EVGA GeForce GTX 570 graphic card. We have often read people saying High-end NVIDIA Fermi cards have excessive memory bus bandwidth, however, we could not find any appropriate research on this topic, therefore we decided to carry out our own research on memory overclocking influence on graphics card’s performance. So, first things first.

EVGA GeForce GTX 570 graphic card:

This is a reference design card.