Asus RS740-E7-RS24-EG - Manual (Page 108)

5-22 Chapter 5: BIOS setup
PCI Express Settings
PCI Express Link Register Settings
ASPM Support [Disabled]
Allows you to set the ASPM level.
Configuration options: [Disabled] [Auto] [Force L0s]
[Force L0s]
Force all links to L0s state.
[Auto] BIOS auto configure.
[Disabled] Disabled ASPM.
Link Training Timeout (us) 5000
Use the <+> or <-> keys to adjust the value.