Dell Power Supply C8000 Owner's Manual page 104

Option
Mezzanine Slot ASPM
(Disabled default)
NB-SB Link ASPM
(L1 default)
PCI Slot Configuration
Scroll to this item and press <Enter> to view the following screen.
104
Using the System Setup Program
Description
Select an ASPM protocol for the mezzanine slot.
Select an ASPM protocol for the northbridge and
southbridge chipsets.