Riser Cards and PCIe Slots

Now, I read somewhere that if you use the top slot, you're giving up 8 PCI lanes shared with the top PCI-E slot So my 4080 would be running

the PCIe slot There are essentially four types of PCIe slots differentiated by their lane count

pcie training error slot 1 The x8 slots are PCIE , and for network or SSD adapters Not sure if the 8 lanes are shared, or if it's x8 per PCIE slot Since it's PCIE

pciex16 slot configuration A PCIe or PCI express slot is the point of connection between your PC's “peripheral components” and the motherboard The term “PCIe card” and “