What are PSS Support and NX Mode?

[Dreamer1]

Can anybody explain what PSS Support and NX Mode under the Advanced\CPU configuration are?
And how to configure (enable or disable) them during overclocking.

[Nicholas_Steel]

A little late but from what I'm understanding, NX is basically equivalent to Intel's "Disable Execute Bit" option, prevents things being executed in memory that is marked as non-executable. It's a security feature.

PSS I'm unsure, I'm looking in to that right now... preliminary finding is that it is a Power Saving feature. Can't really find anything about it, there's one topic on Google Search with people assuming it is Power Saving related, I can't find anything else about it o_o

This is literally the only thing I can find about PSS: https://www.quora.com/What-does-the-PSS-support-Enable-or-Disable-the-generation-of-ACPI-PPC-PPS-and...

I too would like to know more about PSS.

Edit: I also found this which guesses it stands for Power Supported State and is equivalent to Intel's Cool'n'Quiet functionality: https://setiathome.berkeley.edu/forum_thread.php?id=83824&postid=1976998

[Nicholas_Steel]

Dreamer1 wrote:
Can anybody explain what PSS Support and NX Mode under the Advanced\CPU configuration are?
And how to configure (enable or disable) them during overclocking.

I found out this information on the 3 things the ASUS UEFI mentions, no clue what to do with the information though because it's too complex for me: https://imgur.com/a/nti5lLu
Source: https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf

I dunno what the "levels" mean/do/intended scenario for each level when the PSS Support option is enabled on my motherboard. All I know is the default Level consistently triggers a specific BSOD error during Windows bootup at the exact same point in the bootup process, happens every time from a cold boot and intermittently from a warm reboot (began after Hyper V was installed) so I leave PSS Support turned off.

At a very rough guess, PSS Support might be needed for XFR boosting to work.

Edit:

Actually, I think I kinda get it now. PPC tells the O/S what Power States are available. PSS defines the Power States. PCT is what allows the O/S to control Power State. In the UEFI the PPC is configurable and the higher the value you set it to, the more levels of Power States are available for the O/S to dynamically change between.

On my motherboard the default for PPC (value of 0) limits the O/S to only the highest performance defined by PSS and my computer doesn't like that during Windows Bootup. Edit: nope, my PC just hates PSS Support. It still has a very, very high probability of triggering a "SYSTEM THREAD EXCEPTION NOT HANDLED" on Windows bootup when it is enabled and set to any level.

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