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#31
I can see two concerns,
1. keeping your computer case in a small confined space with no air flow will make things worse, it will just circulate hot air.
Move it to somewhere with no airflow restrictions, in the open is better. Minimum of 10cm from any wall or desk for the back and sides.
Better to not set it on carpet as this restricts the air flow as well. Depending on your case.
Still can't see what case it is, can you tell us the brand and model?
2. There are a lot of cables between the HDD cage and the motherboard, try and re-route these cables out of the air flow path, this will help.
Get some cable ties (zip ties) and secure them out of the way.
Did you check the EIST settings?
This will allow it to run cooler when at an idle, even on a medium load it won't run at full speed, when full power is needed it will speed up very fast.
The EIST allows my computer to run at 2-3°C above room tempurature when at idle, it's quite, cool and uses less power.
I would check that the CPU paste (TIM) is evenly spread and a thin layer.
Too much paste can be as bad or worse than none, it should be almost transparent. You are just filling micro imperfections in the metal surface.
If your Son's computer is not OC'ed and hitting 90°C at 100% CPU usage, that indicates a CPU cooler problem.
If it is OC'ed, then I would lower the OC until the heat problem is taken care of.
EDIT:
Those Temp apps are showing 133 X 12 = 1596 MHz, so the EIST is enabled.