Undervolting i9-14900HX

[Kjc139]

I recently purchased a Legion Pro 7i, and plan on starting the (potentially) lengthy process of finding the highest, stable undervolt I can possibly get. I know I need to disable Thermal Velocity Boost, but does anyone have any other tips about settings or anything else before I get started?

Appreciate any input!

 

[unclewebb]

I would start with the core and the P cache set to -100 mV. Also set mV Boost to 100. The ThrottleStop mV Boost feature in the FIVR window can help with stability when undervolting.

If the above is stable try setting all of the above, including mV Boost to -125 mV or -150 mV.

If you are stable at -125 mV, try running Cinebench for a baseline score. After that bump only the core to -150 mV and then -175 mV. Does increasing only the core offset improve your Cinebench scores or reduce temperatures when running Cinebench?

Once you are confident that the above voltages are 100% stable, you can start working on adjusting the E Cache voltage in ThrottleStop. Start at -100 mV and see how things go. If stable try more, if not stable try less.

The 13900HX and 14900HX are very similar. You should be able to find some YouTube videos that show ThrottleStop undervolt settings for these processors. Spend lots of time testing with your fav games. Some CPUs need a little more voltage to be game stable compared to how much voltage they need to be Cinebench stable. No need to immediately find the perfect voltage settings. Take your time. Make small adjustments and keep track of what you are doing so if you reach a point where you are not stable, you can easily go back to the previous voltage setting that was stable.

 

[geq]

You can check my thread https://www.techpowerup.com/forums/...0hx-successful-undervolt.325411/#post-5308845 where unclewebb also helped.
Yours are newer, but I guess the bios setting would be similar.

 

[Simone]

I would start with the core and the P cache set to -100 mV. Also set mV Boost to 100. The ThrottleStop mV Boost feature in the FIVR window can help with stability when undervolting.

If the above is stable try setting all of the above, including mV Boost to -125 mV or -150 mV.

If you are stable at -125 mV, try running Cinebench for a baseline score. After that bump only the core to -150 mV and then -175 mV. Does increasing only the core offset improve your Cinebench scores or reduce temperatures when running Cinebench?

Once you are confident that the above voltages are 100% stable, you can start working on adjusting the E Cache voltage in ThrottleStop. Start at -100 mV and see how things go. If stable try more, if not stable try less.

The 13900HX and 14900HX are very similar. You should be able to find some YouTube videos that show ThrottleStop undervolt settings for these processors. Spend lots of time testing with your fav games. Some CPUs need a little more voltage to be game stable compared to how much voltage they need to be Cinebench stable. No need to immediately find the perfect voltage settings. Take your time. Make small adjustments and keep track of what you are doing so if you reach a point where you are not stable, you can easily go back to the previous voltage setting that was stable.

Can you elaborate or share a pic of where the settings are used?
I'm in the FIVR area and there's 'Adaptive' and 'Static' and currently I just have -0.115mv Voltage Offset in Adaptive and my score in Cinebench went up by like 5-10%

 

[unclewebb]

There are other users in the ThrottleStop forum that have 13th and 14th Gen HX CPUs. They have posted lots of pictures of settings that work well for their CPUs. Have you scrolled through the ThrottleStop forum and looked at their settings?

Post a screenshot of your FIVR window if you have any questions.

my score in Cinebench went up by like 5-10%

It sounds like you are making good progress. Search the internet to see how your Cinebench score compares to other users with the same CPU.

 

[Simone]

This is all I've done.

I don't want to push it exactly for more Ghz, but keep it tame with voltages and more efficient so it runs the coolest while maintaining performance. Hence the -115, sadly Asus BIOS only allows a max of -80

 

[unclewebb]

Most users with HX processors set the P Cache offset voltage similar to the CPU P Core offset voltage.

Setting the mV Boost @ 800 MHz feature to the same value can help improve stability. Set mV Boost to at least 115 before you start increasing the P Cache.

Once you find some stable P Core and P Cache settings, you can try increasing the E Cache offset voltage next.

There are lots of other users in the TechPowerUp ThrottleStop forum with 14900HX processors. Scroll back through this forum to see what offset values they are using. They all seem to get better reliability and better results by using mV Boost.

 

[Simone]

Most users with HX processors set the P Cache offset voltage similar to the CPU P Core offset voltage.

Setting the mV Boost @ 800 MHz feature to the same value can help improve stability. Set mV Boost to at least 115 before you start increasing the P Cache.

Once you find some stable P Core and P Cache settings, you can try increasing the E Cache offset voltage next.

There are lots of other users in the TechPowerUp ThrottleStop forum with 14900HX processors. Scroll back through this forum to see what offset values they are using. They all seem to get better reliability and better results by using mV Boost.

Sorry I'm confused..

When I last did it, my unit froze and I had to reboot.

When you say 'set the mv boost' do you mean +115?

Would you be willing to show a screenshot with the settings illustrated? (I have terrible comprehension issues)

Also were you referring to this?
I'm actually getting rather intimidated now. ';d

 

[unclewebb]

Would you be willing to show a screenshot with the settings illustrated?

I do not own a 14900HX. The "mV Boost @ 800 MHz" feature has been removed in the version of ThrottleStop that I am using.

When you say 'set the mv boost' do you mean +115?

YES

Set mV Boost to at least 115

Just follow the directions I posted. No + sign is needed.

Also were you referring to this?

YES YES YES

mV Boost @ 800 MHz

It is the only item anywhere in ThrottleStop with the words mV Boost.

Have you looked at other forum threads yet? Other users with the exact same 14900HX have already asked all of the same questions that you are asking. There are lots of threads to choose from and lots of images that you can look at for guidance. No need to be intimidated.

When I last did it, my unit froze

Your system likely froze because you were not using mV Boost. Do not change the P Cache offset from 0 to -115 mV in one giant blind leap. Set mV Boost to 115 and then slowly increase the P Cache offset and test for stability as you go. Maybe start at -50 mV for the P Cache offset and then go up further in steps of -10 mV or -20 mV and test for stability again and again. It is best when you first start out to adjust the P Core and P Cache together. Originally you never did this. I would set both the P Core and P Cache to -50 mV and slowly work your way up. Everyone wants to come up with the perfect 100% stable undervolt settings within 5 minutes. It can take days or weeks. Adjust slowly and do lots of stability testing. If games or benchmarks are suddenly crashing then you have likely gone too far.

 

[Simone]

Gah, it's just way too much for me to process (ahaa...) and it's scary.

Thank you so much for explaining though.. I'll try look for those threads and see what I can find. Reason I'm HERE is because I googled "Undervolt i9 14900HX" and this was the result.

I want to ensure I do nothing wrong. ';d

 

[unclewebb]

way too much for me to process (ahaa...) and it's scary.

There are only 3 main values in ThrottleStop that I am suggesting that you should adjust. The Core Offset, the Cache Offset and mV Boost. That does not seem overwhelming to me, especially when you can type 14900HX and ThrottleStop into Google and come up with a pile of examples including screenshots. What is scary? If you use the wrong voltage values, your computer crashes, you restart and then you can try some new values. I can think of a lot of things that are way more scary than that.

 

[Simone]

I don't know, I just saw your claim to 40k, I'm amazed such a thing is possible. :<

This is probably a stupid question but.. will the mV boost @ 800 MHz help against the PL4 bug?

Oh my gosh I just realised you're the author of ThrottleStop itself. Is there a chance you could add a setting so that ThrottleStop launches at Windows startup? ':x