Keep in mind everything in device manager is driven by what someone typed into an inf file somewhere as a text description, including the stock inf files Windows ships with. I could go in and change my PCIe entry to read "Flying Monkeys ISA Bus 65.2" if I wanted to and Windows would show that.

You shouldn't be relying on the text at all for something like this. Relying on the driver file also isn't a good idea, as my PCIe system shows a simple "pci.sys" file.