Question Can I increase the CPU max power limit on a Lenovo Legion laptop ?

[saharsh0201]

I am making a custom water cooling setup for my laptop and wanted to do some other things as well like shunt mod on the gpu.I ran cbr23 multicore and got a score of only 25700 where as there are laptops that are getting upto 33000 on the i9 14900hx. On the 16IRX9 model laptops the tdp sustained is set to just 105 watts whereas other laptops are able to reach 165 watts . Is it possible to change the bios (maybe the bios of the pro 7i which has higher power limits)? In the bios there is no option to change the tdp(it just shows the power limit with no way to change it).

 

[Lutfij]

Welcome to the forums, newcomer!

I am making a custom water cooling setup for my laptop and wanted to do some other things as well like shunt mod on the gpu.
IMHO, what you're looking at doing is counter intuitive for a laptop.

where as there are laptops that are getting upto 33000 on the i9 14900hx.
People on that platform tend to replace the thermal paste and pads for something higher in quality and then undervolt the CPU and GPU.

Is it possible to change the bios (maybe the bios of the pro 7i which has higher power limits)? In the bios there is no option to change the tdp(it just shows the power limit with no way to change it).
You're looking at bricking your laptop and end up with an expensive paper weight.

 

[USAFRet]

I am making a custom water cooling setup for my laptop

WHY?!?

It then no longer becomes a "laptop".

 

[saharsh0201]

I am designing a custom backplate and 3d printing it to hold the water block. Whenevr i need it to be portable i can just swap out the backplate with the waterblock. Also my laptop mostly just sits on my desk.

 

[Misgar]

Also my laptop mostly just sits on my desk.

Have you considered two systems? A desktop and a laptop? It would save time and effort swapping water blocks (but not money).

 

[saharsh0201]

I am a student and i do not have the money to buy a second desktop when i already have an i9 14900hx and an rtx 4070 laptop(it costed me $2300 in india). Also it is fun trying to make stuff and solve problems on my own.

 

[Misgar]

Also it is fun trying to make stuff and solve problems on my own.

I quite agree. I'm currently messing around with various operating systems on an old AMD A8-5600K. It saves messing up the main PC.

it costed me $2300

My most recent laptop cost me the equivalent of US $900. I'd feel scared carrying a $2,300 laptop in case I dropped it!

Take care with the mods. Best of luck.

 

[uWebb429]

tdp sustained is set to just 105 watts

Have you tried using ThrottleStop to increase the turbo power limits? Here are the settings I use for my 14900HX. If you are wondering why the power limits are set so high it is because the 14900HX needs all the power it can get.

With a significant undervolt, it still takes 230W to run both the P cores and the E cores at their full rated speed. I use ThrottleStop to set V/F Point 1 to 150 and then I undervolt the P cores and the P cache by -150 mV.

https://imgur.com/OAdjgpa

View: https://i.imgur.com/OAdjgpa.png


With a +100 MHz overclock for both the P and E cores, a 39K Cinebench R23 run is possible.

https://imgur.com/jAG9ZsJ

View: https://i.imgur.com/jAG9ZsJ.png


I am using a MSI Vector 17 laptop. I have heard that the voltage regulators that Lenovo uses are the limiting factor in the Legion series.

Do not let others discourage you. Getting max performance out of a laptop is lots of fun. Post some pics of your water cooling setup when you get that done.

 

[karasahin]

Do not let others discourage you. Getting max performance out of a laptop is lots of fun. Post some pics of your water cooling setup when you get that done.

👏👏👏

I would very much prefer this kind of attitude over patronizing ones.

 

[saharsh0201]

Have you tried using ThrottleStop to increase the turbo power limits? Here are the settings I use for my 14900HX. If you are wondering why the power limits are set so high it is because the 14900HX needs all the power it can get.

With a significant undervolt, it still takes 230W to run both the P cores and the E cores at their full rated speed. I use ThrottleStop to set V/F Point 1 to 150 and then I undervolt the P cores and the P cache by -150 mV.

https://imgur.com/OAdjgpa

View: https://i.imgur.com/OAdjgpa.png


With a +100 MHz overclock for both the P and E cores, a 39K Cinebench R23 run is possible.

https://imgur.com/jAG9ZsJ

View: https://i.imgur.com/jAG9ZsJ.png


I am using a MSI Vector 17 laptop. I have heard that the voltage regulators that Lenovo uses are the limiting factor in the Legion series.

Do not let others discourage you. Getting max performance out of a laptop is lots of fun. Post some pics of your water cooling setup when you get that done.

I have found the setting and changed the pl1 and pl2 in my bios but for some reason it still shows 105 watts in the lenovo vantage software. And it pulled only 105 watts. I think i am currently thermally limited which is why it is not able to push higher wattage. Something definitely did change tho as it is now showing the new power limits as dynamic power limits in HWINFO.

I assume that it means if the thermals are good it can go upto that power. So i will run the test again after i complete my water cooler and will update. If i need to change some other setting in the bios please let me know.

Thanks a lot man.

 

[uWebb429]

@saharsh0201
Intel CPUs compare the Static and Dynamic power limits and will use the lowest set value to determine whether the CPU should power limit throttle or not. The Dynamic PL1 power limit is set to only 105W. During any long term test, the CPU will power limit throttle based on that. The minimum column shows that this power limit sometimes drops down to as low as 60W. That would really reduce performance.

ThrottleStop has two features to manage this. The Sync MMIO feature will use the same power limit for the Static and Dynamic setting. If you set the Static power limit to 165W, ThrottleStop will copy this value to the PL1 Dynamic limit so both will be set to 165W.

The other possibility is to use the MMIO Lock feature. This feature eliminates the Dynamic power limits entirely. I prefer using this control method. Some laptops might go into a super safe low power mode when they discover that the Dynamic power limit has been locked out. In that case, using Sync MMIO would be better.

Here is how my desktop CPU looks. HWiNFO shows the PL1 and PL2 Static power limits. It does not show anything for the two Dynamic limits because they have been locked out.

Here is how my 14900HX laptop looks when the Static and Dynamic power limits have been synced.

 

[saharsh0201]

Thanks a lot . I did sync the MMIO now. But currently my issue is still with the thermals. I will update once I complete the water cooler.