Explaining PCIe Slots

Looking for PCIE 8x GPUs pcie slot for gpu Slots P1-C2 and P1-C4 are x8 slots with busses direct from the Processor Modules and can be used to install high-performance PCIe adapters pcie 4 in pcie 3 slot PCIe EZ-Latch Unlock the latch of the PCIe slot easily when remove the graphics card in the PCIe slot EZ-Latch Attach and remove your module with

pcie 4 ssd in pcie 3 slot 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