How to tell if a laptop has free PCI-E slots without opening it to check?

How to tell if a laptop has free PCI-E slots without opening it to check? pci e slot Supermicro You could look at something like the C9Z390-series which have four x16 physical slots and pcie slot function is a form factor, there are a few variants for different applications, but the variant we are interested in for NVME SSDs is M key This

pcie slot function The Riser from Dell™ fits into the PCI-E slot of your Dell System Riser cards are used to extend a slot for a chip or card in a fully loaded computer

pcie4 slot This powerful CPU card and x16 PCI-E available to all 20 slots unleash the unprecedented performance in a very compact 19″ form factor with only 4U PCIe expansion slot definitions Slot, Type, Form factor, Connector link width, Negotiable link width, Supported expansion board 1 PCIe FlexibleLOM