I recently upgraded everything except my video card (hd5870/PCIe 2.0) and am now getting 100fps higher in GW2. I was expecting a modest bump, but nowhere near what I got. The one thing that I am most attributing to the increase is that the old mobo was PCIe 1.0 and the new one is PCIe 3.0, allowing my card to run at it's native 2.0 speeds. Is this assumption correct? Is the PCIe version upgrade responsible for this large jump in FPS?