HP/Compaq :: Mobility Radeon 4650 GPU Temp (DV7-2000)

I've got HP dv7-2043cl laptop. I want to find out what max GPU temp do you guys get, when you put stress on the graphics card. I am interested only in DV7-2xxx series with Ati Mobility 4650. Mine is around 46-48 when idle. Temp goes up to 70-74 in around three minutes when I run the Fur Mark stability test (1600x900, MSAA 8x, post processing and xtreme burning turned on). Clocks are at stock frequencies.

I wouldn't care about the temperature (it is not actually that high), but I have a problem. The computer just turns off when I play some games. For instance, if I play Fallout 3 at ultra settings (1600x900, 8x msaa, hdr), the computer powers off after a couple of minutes. Same thing with Crysis Warhead at high setting (1280x720, no msaa), even Half-Life 2 at max settings! When I lower the resolution in Fallout 3 to 1280x720 and MSAA to 4x, everything seems to be fine. Same thing with Half-Life 2. No similar luck with Crysis though. Looks like Crysis utilizes every single bit out of the GPU in any case.