Asus PS4 - Manual (Page 38)

Chapter 2: Hardware setup 2-20
The heatsink on PIKE 1078/PIKE 2008 Series might interfere the components
on the expansion card. Ensure that the height of the components is less than
5.8 mm.
10. Set the SGPIO_SEL1 jumper on
the backplane to pin 2-3 when
connecting data cables to the SAS
connectors on the motherboard.
9. Connect the SGPIO cable to
the SGPIO1 connector on the
motherboard.