USB PCIe card in x16 slot?

The first PCIe x16 slot is guaranteed to run at x16 speed, but with the second or third PCIe slots, there's no guarantee it will run at x16

Scalable parallel computing GPU dense servers that are built for high performance 2 GPU 4 GPU 8 GPU Ultra Durable PCIe Slot • PCIe® Slot • Running

what is a tf slot Buy a couple, and use a grinder, saw, or steel file, to file off a little cut so the x16 slot would fit in an x8 slot It's a better solution

what is a m2 slot The GPU adapter requires two slot space for accommodating the air baffle 2The slot is not available to install other adapters in the