You could try choosing Custom instead of Superclocked, increase the core clock, and not increase the core voltage as much. Usually dummy overclocks choose more voltage than necessary to ensure dummy stability.

Or, you could try stock speed, compare performance and see if overclocking is really even beneficial or worth it.

With Custom mode, you can create a custom fan curve in Precision X Mobile; but you will need to set a custom fan curve every time you boot, because for some reason Precision X Mobile forgets the fan curve each time you close it.

chefmattyp2.0
90+ temps shouldn't be normal at all we can have a bbq with that cpu

Unfortunately, it is not too abnormal; especially when using a dummy overclock mode which is designed for the lowest common denominator. And even more especially if using the default fan curve and not using the fan boost function or a custom fan profile. Dummy overclocks are for dummies. You can get a better overclock and better temperatures if you put the work in. If you aren't willing to put the work into it, I suggest that you run it at stock speeds; otherwise you are probably doing more harm than good.

Like what ty_ger07 already said, the presets are not the best, because they can't fine tune for each chip, so the voltage is usually a lot higher than actually needed, which generates more heat.  So the best is to set up a custom profile and set the clocks that you want and mess with the adaptive voltage offset to get the least voltage necessary for that particular multiplier and be stable. 
Also he mentioned, aggressive fan curve when overclocking is necessary, or just use fan boost.
Keep in mind this is a thin laptop, but even thicker ones have trouble sometimes overclocking the CPU and running the GPU underload as well, and overclocked too.   So in most games, overclocking the CPU is not worth the extra heat for a few FPS extra.  Probably best to use stock clocks, and if need be save the thermal headroom for overclocking the GPU, but only if necessary.  
Now when rendering or some other CPU intensive task is needed, then use the CPU overclock (custom preset) if you need to, since the GPU is not under load and there is more thermal headroom for OC.

Alright guys, thank you very much. I tried to undervolt by - 30, and it seems stable ( at 40,39,38,38). More than - 30, I had a crash tested with the bench of Xtu. But the temp with - 30 are much lower. I know very well that is useless Oc just a little bit, but with the normal preset i would have a CPU slower than the common 6700hq😂. So for that I wanted to be at least on pair ( and this CPU is nearly two gen old).

vistarshook
6700HQ is all four cores at 3.1GHz,  7700HQ four cores 3.4GHz and the 7820HK all four cores 3.5GHz.  
I find it easier to test voltage stability setting all four cores to same speed, single core, dual core speeds don't make that much difference in performance.  What are you setting the Ring clock to?  I noticed on mine, that the ring clock doesn't overclock very well compared to the cores, so I just leave it at 36 when running at 3.9GHz or higher on the cores.  
If you set yours to all for four cores at 38 and ring at 35 (ring is always 300MHz less than core), you should be able to get a higher undervolt, but yeah, sometimes the cpu is badly binned and requires more voltage than others.
For comparison, mine at 39-39-39-39 ring 36 I manage -90mV.  at 40-40-40-40 ring 36 , -40mV.

Mine was definitely less lucky :(. I tried all 40 and ring 36, but crashed at - 30. I'm stable with 40,39,38,38 with - 30. Should I try to touch the vcore target or Is useless? I always leave on auto ( and Adaptive the other option).

vistarshook
when using adaptive, ignore target and set the offset.....when using override ignore offset and set the target.
bummer you can't undervolt more to get some thermal headroom.  what to do.....other than returning it, I supposte repasting if you know what you are doing and are willing to potentially sacrifice warranty.

I will think about repasting, are there any guide or videos for this specific model? I couldn't find nothing on the Web. Thank you for your help, with the undervolt in any case a reduced the temp a bit, but I'm still hitting 80 degrees sometimes ( with 3.5ghz on all cores).