Immediately after the official release of video card AMD Radeon HD 7970 there were references that the work in the mode PCI Express 3.0 offers no significant advantages in comparison with the previous generation bus. The public quickly concluded that the benefits of PCI Express 3.0 will be fully disclosed when using the combination of multiple graphics cards.
Tests were conducted in the popular computer games at 1680 x 1050 pixels .Curiously, there was no difference in performance at the interface bandwidth to 16GB / s (16 lines PCI Express 3.0) or 8 GB / s (8 lanes PCI Express 3.0, or 16 lanes PCI Express 2.x) . This means that the capacity of processors Ivy Bridge, supporting only 16 bus lines will be enough to work with a bunch of two graphics cards without compromise.
Moreover, computer games were not very sensitive to bandwidth. The results are as follows: