PCIe GEN 3 slot with PCIe gen 2 controller causing anomalous

Gen2 on this mb somehow lane distributionbandwidth layout of mb caused GPU in slot

From the System Utilities screen, select System Configuration > BIOSPlatform Configuration > Network Options > Network Boot Options >

pcie 50 slot PCIe supports PCIe Gen 1, PCIe Gen 2, and PCIe Gen 3 devices PCIe With options for 1x, 2x, 4x, 8x, and 16x slot configurations

pcie slot size If everything is working fine, then you should not change these settings Gen1, Gen2, Gen3 refers to PCIE , and signalling standards