So basically, after doing a fresh W10 install and DL'ing all latest drivers off Asus website, I still had a PCI to PCI bridge with generic driver and when I let Windows search for better driver, it installs Intel Xeon E3 - 1200/1500 v5/6th Gen Intel Core PCIe Controller (x16) - 1901. I can't find the recent driver that goes with my 300 series chipset.