Mashine 1 full mode

PCB
34-57-36-59
41-67-41-70
39-65-40-70
37-58-35-61

CHIP
49-72-51-74
56-82-56-85
54-80-55-85
52-73-50-76

Mashine nr 1 low mode

PCB
33-44-35-46
38-49-40-52
38-48-39-51
34-44-33-46

CHIP
48-59-50-61
53-64-55-67
53-63-54-66
49-59-48-61

Mashine nr 2 full mode

PCB
32-53-34-57
40-70-44-77
39-69-42-77
33-57-32-62

Chip
47-68-49-22
55-85-89-92
54-85-59-92
48-72-47-77

Mashine nr 2 low mode

PCB
31-32-32-44
37-48-38-50
36-47-37-50
31-42-30-44

CHIP
46-57-46-59
52-63-53-65
51-62-52-65
46-57-45-56

This is 2 of my 4 mashine.
I am used to s9i at pretty hi temperature 85-90 in summer but the S15 is shutting down at 96.Temp. room is 20 degrees. It migth be to smal innflow of fresh air in the room as i suspsect low pressure. The fans are blowing in.

Thanks for answer.
No, since there brand new I havent opened them.
Strange is that is the same place one both

The one shows:
46-70-54-54
45-80-49-90
49-80-52-92
49-54-70-49

The other :
49-70-54-59
49-80-54-91
49-82-55-92
54-70-59-55

Been running 4 of S 15. Two in full mode. 2 of the 16 chip temp. show 90-92 degrees. The rest between 49-80. Airtemperatur 20 degrees. It shut down at 96. Any idieas?

I have a 6 pins riser.
From my extra CPU (Corsair RM750x) goes to cables (6(2) and a 8 pin) to the GPU (GTX 1080 ti turbo)
How could I Power the riser. One cable is 8 pin(one pin seems empty). Could I put this end in the PSU and the other end 6(2) in the 6 pin riser?

Many thanx for any advise.