I have on this Dell PowerEdge T320 motherboard some PCIe slots that are marked G2 and others that are marked G3. They are also marked PCH or CPU1, in paranthesis.
1. What do G2 and G3 stand for? Same as PCIe version 2.0, etc.?
2. What do PCH and CPU1 stand for?
3. One of the two x4 G2 slots is marked x1, although it is an x4 in size. Why?
4. There is an x16 G3 slot without a socket. What is that for?
5. Can a PCIe v.2.0 card be plugged in a 3.0 slot (is the slot backwared compatible)?