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 wrote:

Yes the BIOS is pretty buggy, on balanced n performance too after sometime the fans don't ramp up. The solution is going in BIOS n exit discarding changes. This makes fans behave normal.

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Which Bios? I have never had problems with fans either. They always ramp up when needed. I have never had to go to bios. Always updated to the newest bios version. 

I am on 35ww. But happened with older BIOS too. Maybe my tweaked setting of Undervolting, underwatting causing it

Steam has demo version of the 3DMark for free and atleast before Xmas full version was less than 4 euros. Get it and run default tests, and put the results here, so we can see the differences on different setups.

I did some testing this morning, just to really find out what these three fan modes do. I changed to Quiet, booted and checked that it still was on quiet and started testing. I paid attention to fan sound, even measured it from the left side of the laptop with db meter. Also tried to listen how fast and how efficient they ramp up on different modes. The tests I made with 3D Mark Time Spy and with default settings.

First of all. Even on quiet mode if laptop works correctly, fans do ramp up. They do it little slower than on Performance and stay somewhat lower power too. Then again, the difference to the balanced mode is very small. On quiet mode laptop gave 45db, on balanced 50db and on performance 53db. On ears it sounded like the difference would have been much bigger on performance mode.

And now on the scores, Watts, Mhz and temps.

Quiet Mode:

Score 5675 (GPU 5985/ CPU 4388) 

CPU MAX temp 88c°

CPU MAX power 44,9W

CPU MAX speed 4293Mhz

GPU MAX temp 60c°

Balanced Mode:

Score 6069 (GPU 5953/ CPU 6825) 

CPU MAX temp 97c°

CPU MAX power 74,3W

CPU MAX speed 4293Mhz

GPU MAX temp 63c°

Performance Mode:

Score 6218 (GPU 6114/ CPU 6886) 

CPU MAX temp 97c°

CPU MAX power 75,9W

CPU MAX speed 4293Mhz

GPU MAX temp 63c°

As you can see, the quiet mode actually affects very little on GPU performance, but much more on CPU. This can be seen also on temps, which are nearly 10c° lower on CPU but only 3c° on GPU. GPU stays very cool on every mode. It is also very easy to see which mode is the worst and it is the balanced one. On it the temps are as high as on performance mode, but the performance is little worse. So if you really need to get everything out of the machine, you need the performance mode (but then you really put heat on your CPU). On my games the quiet mode has been fast enough so far. Far Cry 3 demands most from CPU and has FPS round 60 on quiet mode, but it rises only about 10-15fps on performance so I rather use quiet. I dont see the difference with my eyes.

So here are my results. It would be great to see others too!

Quiet: https://www.3dmark.com/3dm/42755821?

Balanced: https://www.3dmark.com/3dm/42755979?

Performance: https://www.3dmark.com/3dm/42756130?

What BIOS version do you have (during those test) ?

Those max CPU temps are quite high, but it may have been just a few spikes. For better context, average temp values during the test runtime should be taken into consideration.

Personally I'm sticking to undervolt+underclock in order to keep temps safely below the 80C mark.

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 wrote:

What BIOS version do you have (during those test) ?

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35WW

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 wrote:

Those max CPU temps are quite high, but it may have been just a few spikes. For better context, average temp values during the test runtime should be taken into consideration.

Personally I'm sticking to undervolt+underclock in order to keep temps safely below the 80C mark.

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According to 3D mark, while testing mainly GPU the CPU was running at about 60-65c° also, but when on CPU test (and this with performance mode) CPU spiked to 96c° and 97c° otherwise it was round 90-94c° during test except at the beginning when temps where lower. There is no average data, but I assume it was about 90c° during CPU test on performance.

For some reason 3D mark temp readings on quiet mode are different than HWMonitors. On other modes there were no differences. On Quiet HWM sais max temp 88c° and 3DMark only 77c°.

Temps usually stay around 80c° while playing games on quiet mode. So I will stick to it until something better is available.

Here are my results with undervolt+underclock:

SPECS: 

Lenovo Y540-15IRH

BIOS version: BHCN35WW

OS: WIN10

CPU: i5-9300H
GPU: RTX 2060
SSD: 512 GB PCIe NVMe
RAM: 32 GB DDR4 @ 2660 MHz

3DMARK results:

1: https://www.3dmark.com/3dm/42759113? 

2: https://www.3dmark.com/3dm/42759424?

3: https://www.3dmark.com/3dm/42759731?

It is worth nothing that we may be comparing apples and oranges here as your test results are for the i7 variant and mine are for the i5.

Nevertheless I still believe that this is the way to go in order to keep temps well in the safe zone, especially if we're considering long gaming sessions.

Well those results kind of prove to me that there is no big difference on just using the quiet mode or using the undervolt/clock. Results are very close. My temps might be a bit higher, but when playing games for several hours max temps are actually lower than on tests. CPU temps might still be a bit higher on quiet mode, but well under 90c° on it too. I appreciate sharing these results r4a because this is something I really have wanted to find out.

Edit: Checked on older tests. On Far Cry3 max CPU temps on long sessions are usually round 82c°.