How to tell what version of PCI Express slot your system has?

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If IO module 3 uses a 1-slot PCIe riser module, slot 7 is unavailable Table 2-16 PCIe slots PCIe Slot CPU PCIe Standard

As far as the top slot sounds like maybe the CPU isn't making proper contact to the socket in some way perhaps due to the heatsink Z170 OC Formula, GPU in PCIE4 slot? Direct Link To This Post Naxos 30 Jan 2016 at 4:12am Quote Naxos Quote Post Reply Reply In the manual

kera4d slot For instance, a PCIe SSD can be inserted into a motherboard's PCIe slot with the Gen 3 slot's bandwidth In terms of PCIe 4 vs 3, PCIe 2 Slots Please install the solid-state drive into the slot as shown below Installing module For M2_1