- Why GPU0 has PCI 1.0?
It's in fact the hardware ID of your PCI slot they're numbered like this. slot 1 is 1:0, slot 2 is 2:0, you probably jumped one slot to make the card fit on the motherboard.
It depends on the motherboard - some SKIP PCI-E slot ID numbers when assigning them to certain slots even if you're using all of the slots.
There's also a well-known issue where the DRIVER doesn't always assign the "id number" of the card in the same order as the PCI-E identifiers - both in Windows AND in LINUX - that affects all multi-GPU miners I've worked with, a couple even have gone so far as to come up with a "work-around" to MAKE the displayed miner numbers line up.