The i7-9750H in my laptop running Cinebench R23 multicore with all cores at constant 4.0GHz;
- Original, no undervolt, needs ~100W.
- With -125mV core and cache needs ~75W.
- With -125mV in cache and -175mV in core it needs ~68W.
- With -125mV no cache and -210mV in core needs ~61W.
Lowering more than -210mV in core doesn't change the results.
40% decrease in energy consumption by reducing the temperature from 95/97°C to 77/79°C.
Interesting data, I'm using 9750H as well so i would like to share some data
Im using Hp Pav Gaming 15, it only allows short burst before the 45w limit lock(on 1650 model)
the 1660Ti Max Q variant of this model dont have the PL lock, hence able to boost longer without being restricted
So i set it to all core 3.4ghz to be accurate as possible
-200mV core -125mV cache~42.7w
-210mV core -125mV cache~41.7w
above 210mV, i need to bump the cache same value in order to see the wattage difference
-215mV core -130mV cache ~41.2w
-220mV core -135mV cache~40.7w
-225mV core -140mV cache Crash!
So far base on the results, every 10mV reduction, its using 1W less
For daily usage, im using all core 3,6ghz with -215mV -130mV,
i might revert to -210mV -125mV, for long term stability, since the difference max load is only 0.5W
That is what I found with my desktop CPU. I am not sure why but Cinebench is not a good stability test when adjusting voltages. TS Bench stable and game stable seem to need a similar amount of voltage.
Adding 10 mV to the CPU cache offset voltage when you first start seeing errors in the TS Bench seems to work well. If you see errors at -135 mV then add 10 mV to that and use -125 mV. That should be fairly stable.
I like all the people that spend hours doing stability testing. I find that the TS Bench can get me some very stable voltage settings within a few minutes of testing. After that you can use your computer normally. If you get any errors while gaming or BSOD, add another 5 mV.
Hi, unclewebb
Same as OP, recently been reading 20 pages thread maximizing undervolt
Used to set -150mV for both core and cache before settling on your guide with -215mV cache and -130mV cache
Appreciate if you would check my setting to see if anything left unchecked or improve?
Thanks a lot
The R23 run able to boost 3.6ghz using 50w for a while before lowers down to 3,58ghz 45w PL lock
I noticed the higher boost clock i set, 3.8ghz-4ghz the boost duration period shortens