Unusual undervolting limits of the cpu ? Or is it normal

[antriksh]

I have an ideapad 330 with I5-8300H and GTX 1050 4gb. My cpu was originally limited to 75° C . To get it more thermal headroom and make it run cooler on idle I undervolted using throttlestop. Earlier I thought that cache and core were supposed to be same so I has set them both to -133.8 mV as it was the minimum I could get stable with -40 mV on iGPU and unslice. Then some time earlier I stated tinkering with it a bit more and wasn't stable below -133.8 mV on cache but -146.5 mV on core. I read on the internet that cpu cache is more able to undervolt rather than core. Is it just due to silicon lottery or should I push it back to -133.8 mV. I also have an undervolt of +126mhz and overclock of +200 mhz. I have tested the latest undervolt with aida64 stress test on cpu and cache with heaven at 900p on extreme preset for two hours. Than for 30 min more with fpu additionally ticked.

 

[unclewebb]

My cpu was originally limited to 75° C .

Lenovo has been doing some funny things about lowering the thermal throttling temperature way below the default Intel spec of 100°C. The latest version of ThrottleStop has a possible fix for this issue. Go into the Options window and try setting the PROCHOT Offset value to 0. If this works, I would also use the new Lock PROCHOT Offset feature so Lenovo software does not change this when you least expect it.

ThrottleStop 875 b4.zip

drive.google.com

Just download, unzip and copy the new ThrottleStop.exe into your ThrottleStop folder.

On 8th Gen CPUs, some users have had success undervolting the CPU core more than the CPU cache. If the cache is OK at -125 mV, the core might be OK at -200 mV.

I am not sure what overclock you are talking about. You cannot overclock an 8300H. The Turbo Ratios should be set to their default values of 40, 40, 40, 39. Adjusting the 4 cores active value from 39 to 40 does not work.

With a Lenovo laptop, it would also be a good idea to use the FIVR - Disable and Lock Turbo Power Limits feature. Download and unzip the RwDrv.sys file from Mega first and copy that into your ThrottleStop folder.

12.2 KB file on MEGA

mega.nz

Post lots of ThrottleStop screenshots if you need help.

 

[antriksh]

Thanks, fixed It

 

[TheTigerJunior]

On 8th Gen CPUs, some users have had success undervolting the CPU core more than the CPU cache. If the cache is OK at -125 mV, the core might be OK at -200 mV.

does it work on ULV cpu?

 

[unclewebb]

does it work on ULV cpu?

It should but there has not been much user testing of this. If you have access to a ULV processor, run something consistent like Cinebench R20 or R23 and see if it makes a difference.