What PCIe slots can be used when only installing CPU1 on Z10 server/WS board?

Please check block diagram in Z10 series models user manual.

For example, if you use CPU1 on Z10PE-D16 WS, only PCIe 2/3/4 can be used.

If you would like to use all PCIe slot, you have to use dual CPU on Z10 server/WS board.