ASPM Settings in Asus BIOS

My new Asus z790 board has various settings for ASPM currently disabled by default. Is there any advantage in enabling them for a desktop PC only have a NVidia GPU in the main PCIe slot:

Here are the settings currently disabled:

PCI Express Native Power Management

Allows you to enhance the power saving feature of PCI Express and perform ASPM operations in the operating system. Configuration options: [Disabled] [Enabled]

The following item appears only when PCI Express Native Power Management is set to [Enabled].

Native ASPM
Set this item to [Enabled] for OS Controlled ASPM, or set this item to [Disabled] for BIOS controlled ASPM. Configuration options: [Auto] [Enabled] [Disabled]

PCH - PCI Express

DMI Link ASPM Control
Allows you to control the Active State Power Management of the DMI Link. Configuration options: [Disabled] [L1] [Auto]

ASPM
Allows you to select the ASPM state for energy-saving conditions. Configuration options: [Disabled] [L1] [Auto]

L1 Substates
Allows you to select the PCI Express L1 Substates settings. Configuration options: [Disabled] [L1.1] [L1.1 & L1.2]

SA - PCI Express

DMI ASPM
Allows you to set the DMI ASPM Support. Configuration options: [Disabled] [Auto] [ASPM L0s] [ASPM L1] [ASPM L0sL1]

DMI Gen3 ASPM
Allows you to set the DMI Gen3 ASPM Support. Configuration options: [Disabled] [Auto] [ASPM L0s] [ASPM L1] [ASPM L0sL1]

PEG - ASPM
Allows you to control the ASPM support for the PEG 0. This has no effect if PEG is not the currently active device. Configuration options: [Disabled] [L0s] [L1] [L0sL1]

PCI Express Clock Gating
Allows you to enable or disable PCI Express Clock Gating for each root port. Configuration options: [Disabled] [Enabled]

Steve C said:

Is there any advantage in enabling them for a desktop PC only have a NVidia GOPU in the main PCIe slot:

Click to expand...

I wouldn't mess with any of that, unless there's an obvious need.
Don't make the mistake of over-thinking things. 90% of the time the BIOS defaults are on the correct setting.

Btw... here's the PDF for your BIOS settings...

Ghot said:

I wouldn't mess with any of that, unless there's an obvious need.
Don't make the mistake of over-thinking things. 90% of the time the BIOS defaults are on the correct setting.

Btw... here's the PDF for your BIOS settings...

https://dlcdnets.asus.com/pub/ASUS/mb/13MANUAL/PRIME_PROART_TUF_GAMING_INTEL_700_Series_BIOS_EM_WEB_EN.pdf?model=TUF%20GAMING%20Z790-PLUS%20WIFI

Click to expand...

Yes, that what I copied the details from which don't explain much!"

Steve C said:

Yes, that what I copied the details from which don't explain much!"

Click to expand...

I have this method... if I don't understand the BIOS setting, I leave it set where the ASUS guys set it.
If down the road... you see articles, videos, ASUS forum posts, that explain them or show the need for them... then play around.

Also remember the Tools > Profiles section of the BIOS. Use it.
It's like backup software for the BIOS. Set the main settings you need to set, then Save that to a Profile.

Then... if you experiment, and want to "go back" to your previous settings... just load the previous settings Profile.



Just about all motherboards these days, (not just ASUS), have BIOS Profiles. I recommend, EVERYone use them.
Made my life easier, too many times to count.

One of the main things I use the Profiles for, is to save the BIOS settings before and after a BIOS update.
Like, I know I have Profiles for the latest 4402 BIOS and the ones before as well.


So, do your basic settings, that you do on every motherboard, update to the latest BIOS, then save it to a Profile.
Some basic settings I do...

fTPM (PTT for Intel), Secure Boot, no ASUS splash screen, no BIOS fan control ( I want the fans at 100%), Advanced view In the BIOS, RAM freq, timings and voltage, and maybe one or two others that I can't think of at the moment.

This is also the first build, I haven't bothered with overclocking. It's much more relaxing that way.
Zero BSODs or OS corruption as well. It's almost too easy. ^^



Would you like to swing on a star
Carry moonbeams home in a jar
Be better off than you are
Then don't you dare overclock.



I swear... there's a song for... everything.





I mean... just look how happy my computer is...

If you simply must overclock... then do it to a car, not your computer...

I usually disable these on my Z590. These are dynamic power savings modes (ASPM = Active State Power Management). I don't care about saving power on a desktop. Enable they do adversely affect performance some.

I do have the PCH (your Z790 chipset) L1 & L2 substates enabled though as my Z590 chipset ran hot and this helped reduce the PCH temperature significantly). YMMV.

I don't know about that Asus board but Asus often don't properly cool the chipset. They are using the same design as the past, but these chipsets run a lot hotter now. They have a weak passive aluminum heatsink on it, then they cover that with a plastic shroud that prevents any air circulation. My z590 chipset (PCH) was running at 75c idle. I got it down to 50c idle by removing the plastic shroud and enabling the L1 substates.