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GeForce GT 540M heating (and throttling)

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http://superuser.com – I have a Sony Vaio laptop (VPC - F22L1E, sometimes listed as F22L1E/B), with a 1 GB GeForce GT 540M graphics card. The GPU heats from room temp. to about 55°C with just booting and surfing on the web. I was playing a game that I played lots of times before, without problems. After a minute or so, there are sudden decreases in the fps, lasting for only a second or two, which I think is throttling. GPU-z logs revealed that this causes the temperature to drop to ~70°C from 89°C. And the GPU core clock goes from 670.8 MHz to 202.5 MHz. I can't remember the exact timeline, but I made a few cha (HowTos)