According to MacVidCards.com, one must use a modified ROM on a stock PC video card to get it to use the PCIe 2.0 spec vs the PCIe 1.0 spec when installed on a Mac Pro. This MacRumors post suggests that it is not necessary to use a "flashed" ROM on an NVIDIA 1070 card if using the web drivers as it will work in PCIe 2.0 mode without being flashed, but Windows will only work in PCIe 1.0. However, after purchasing a GTX 1070 Founder Edition and installing the Web Drivers, I'm see the the GPU only has a 2.5 GT/s link speed. Does anyone know how to get the GPU to use PCIe 2.0 mode instead of PCIe 1.0? Is the only option to pay for a GPU flashing service?