I just did a couple of Cinebench 24 runs, and got 898 points.
While running the CPU was reported at 100°C and 40W TDP. The laptop pulls 80-90W from the wall.
I expected the TDP to be above 45W.
Could someone run the same benchmark and report?
TDP is a thermal envelope measure for sizing cooling requirements, rather than a performance measure. You may have got a better binned chip that needs less voltage. Less voltage = less power = better battery life.
In case anyone ever cares: I opened the laptop up again and tightend the 4 heatsink screws. Now I get 45W TDP, 4.2-4.4 GHz and 904 points in Cinebench.
Lot less performance increase than I expected, but I guess it’s fine.
Running cinebench r23 in wine under Ubuntu 22.04 with all drivers installed, I got 14928 points multi-core and 1711 points single-core. Temperatures were rather low (75°C range, power around 45W), the fans were barely audible. 7840HS, 1x 32GB RAM, no GPU
Single core power consumption was between 15W and 22W.
Maxon revised the scoring system for Cinebench 2024 for it is completely different compared to Cinebench r23 scores. If you have the time, could you send the Cinebench 2024 scores?
Cinebench 2024 - 825 multi and 104 single.
Cinebench R23 - 13529 multi and 1766 single.
Cinebench R20 - 5235 multi and 692 single.
Comparing these numbers to what I can see over at notebookcheck tells me I am thermal throttling like crazy. I am able to hit the expected single core benchmarks but I fall very short of the multi core numbers. I was watching in HWInfo and HWMonitor to see what was going on and core #4 would hit 100C within a few seconds. I also noticed cores #2 and #6 would also get very hot at 97-98C. The remaining cores were anywhere from 78-92C. The package power was never able to climb over 31W when using the 180W charger in any port on the High Performance power profile. Considering this is marketed as a 45W TDP package, I am hoping this is just a case of a bad thermal interface somewhere.
I was originally using Ubuntu 22.04 and watching temps in Tctl and thought the report of 100C was incorrect since the laptop didn’t seem that hot. I wanted to investigate further since my clocks really couldn’t get past 3.6-3.7Ghz, so I installed Windows 11. This allowed me to see more granular data and I was very surprised to learn Tctl was in fact reporting an accurate package temp.
Now that I am running Windows, I was able to run the tests on a few different power profiles. I found that with my current thermal throttling issues, I would get near the same result using the Balanced profile as I did with the High Performance profile. I even observed core #4 hit 100C in Balanced mode while disconnected from the AC power. During the benchmarks, I observed about 91-92% CPU usage due to the thermal throttling issues.
May be worth it to test what power load your CPU can sustain with a non-AVX load.
IIRC AVX layouts have pretty high density on the die, which means that there can be hotspots which cause the throttling.
I went ahead and tried Prime95 with AVX-512 disabled and I can sustain about 39W that way. Still seeing 2 cores throttle at 100C due to hot spots. I also tried with AVX2 disabled and saw the same result. Completely disabling AVX saw my power drop to about 37W. I did all tests using smallest FFTs.
My fans do ramp up after a few seconds.
I understand AVX is hard on the processor, but tools I use each day like x265 utilize it. Considering there are benchmarks showing what the 7940HS can do under an AVX-512 load, I am hoping there is some headroom to be found in the current cooling solution. I would be curious to know if AVX loads were considered during the cooling validation process.
For what it is worth, I am communicating with support about this and they are taking it seriously.
In addition I would look for the status on the thermal paste, whether the laptop itself get ample cooling (maybe elevate the intakes slightly), whether the removal of the palmrest helps (it should, consider these are turbine fans)
I recall in LTT’s video the FW16 thermal solution helped by Cooler Master does pretty well. Are both fans spinning? Are both fans spinning fast?