Onboard m2 slot or pcie m2 expantion card? which is faster?

is a slot that can interface with SATA , PCI Express

Such motherboards usually have an extra x4 slot connected to the chipset, so in that case you should move your GPU to that slot and install the

pcie slot dimensions There are some NVMe drives that are designed to fit into a standard PCIe motherboard slot much like a graphics card, but most NVMe drives use

pcie 4 in pcie 3 slot PCIe To 2-Ch Adapter Type B for Raspberry Pi 5, Compatible with 2280 2260 2242 2230 size NVMe Protocol SSD, 5Gbps Data Rate,