9300h Undervolt settings ?

[Sukye]

Hello !

I've had an acer nitro since November 2019, and it's been undervolted this whole time with these settings:

-cpu : -140.6 mV core/cache
-gpu : 1660 ti mobile @1900mhz+ 0.900V

I saw that it was possible to have a 2:1 core/cache ratio. And it seems to be stable since a few days.

Do you have any suggestion to change in the settings to improve a bit ?

Without undervolt :
R23 10min test : ~4100
R23 10min test undervolt : ~5255
R23 10 min undervolt after 2-3h cyberpunk 2077 : ~4950-5050

I see a performance gain, but the temperatures do not change

If you suggest to change some parameters, can you tell me what they do ?

 

[unclewebb]

a 2:1 core/cache ratio

There is no specific ratio that is necessary. A 2:1 ratio is an internet myth. The core and cache offset do not need to be set equally and they do not need to be set to a 2:1 ratio. Setting the core offset request to about 75 mV to 100 mV more than the cache works well for many 8th and 9th Gen mobile CPUs like you have. Setting a much bigger difference will still work but you will reach a point where using a really big number for the core offset will simply be ignored. -200 mV or -300 mV or -1000 mV for the core might not make any difference. Using -280 mV might not be any better than -200 mV or -220 mV. Do some testing to find out. Run the TS Bench 960M test and make sure it does not report any errors.

Turn on the Log File option when playing a game or testing. When you see PROCHOT lighting up red on the main screen, that means your CPU is reaching the thermal throttling temperature and slowing down. You could try increasing the power limits but that is only going to make things worse. Have you ever disassembled your laptop for a thorough cleaning? It might need it.

If you can improve your CPU temperatures, I would check the MMIIO Lock box and I would set the MSR PL1 and PL2 limits to 60 instead of 45. I would set Power Limit 4 to a value of 0 so this limit is ignored and I would set IccMax for the core and the cache in the FIVR window to the max, 255.75.

Post a log file. It will show what is limiting your CPU.

When running Cinebench, keep an eye on the CPU speed and watch the Limit Reasons window for any power limit throttling. You cannot go faster or solve a problem until you know what the problem is.

 

[Sukye]

Thanks for your answer,

TS Bench 960M does not detect any errors. My laptop is clean , but for 800€ it's maybe the cooling that is insufficient?

 

[unclewebb]

Your log file shows constant TEMP messages which indicates constant thermal throttling is in progress. You cannot possibly expect to get consistent performance out of a laptop that is overheating like this.

Did you disassemble your laptop and replace the thermal paste? What did you use? I have heard that Noctua NT-H2 works well direct die on laptop CPUs. Some thermal pastes that are readily available and popular on desktop CPUs are horrible when applied direct die to laptop CPUs. They can quickly pump out which will send your CPU temperatures up and up.

It looks like PROCHOT Offset was originally set to 8. Lenovo used to like to do overly conservative things like that. If you boot up and PROCHOT Offset is set to 8 and you see the lock icon near this setting, there is no point in changing the offset to 0. A locked value cannot be successfully changed. If you do not see the lock icon, I would set PROCHOT Offset to 2 or 3. Increasing the temperature when your computer starts to thermal throttle can improve performance.

Unless you find a way to improve cooling, your laptop is not going to be able to run consistently or run at its full rated speed.