Thanks for that Daugirdas.  In your particular case, I pop off the
keyboard and check that the CPU heatsink is bonded correctly to the CPU
using a layer of thermal glue or a thermal pad.

The machine shouldn't be able to overheat itself /that/ quickly, and
something is causing the CPU's last-resort thermal trip diode to kick
in.

(Yes, I've heard reports of 2? (I think) machines where overheating
issues were caused by a missing pad at manufacture time and I've
personally come across two machines on the second-hand market where the
heat-sinks had been stuck back on with *blue tack* by the previous
owner...).

-- 
CPU overheats during high usage "throttling <not supported>"
https://launchpad.net/bugs/22336

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