radeon.pcie_gen2=1 unusable with AMD 990X chipset

Hi, last week I bought a new ASUS M5A99X EVO AM3+ mainboard. It supports PCIe 2.0. I also have a Radeon 6570 videocard (PCIe 2.0) and a 3ware 9650SE 8LPML RAID card (PCIe 1.0). There are 3 PCIe x16 slots on the mainboard, two of them share x16 wiring so single card x16 or dual card x8/x8 is

radeon.pcie_gen2=1 unusable with AMD 990X chipset

Hi, last week I bought a new ASUS M5A99X EVO AM3+ mainboard. It supports PCIe 2.0. I also have a Radeon 6570 videocard (PCIe 2.0) and a 3ware 9650SE 8LPML RAID card (PCIe 1.0). There are 3 PCIe x16 slots on the mainboard, two of them share x16 wiring so single card x16 or dual card x8/x8 is