|Jam's quotation doesn't surprise me, that sounds like a pretty beefy graphics card for a laptop chassis...|
as for monitoring temps, reboot and enter the BIOS (typically by tapping DEL or F12 or something during bootup). There should be a category like "System Monitor" or "Hardware Monitor" or something like that. This should tell you things like CPU Temperature, fan RPMs, etc. Keep in mind that the hardware has time to cool off between when it crashes and when you get into the BIOS...
There are also 3rd party software options that run in Windows that monitor your temperatures in real time, but this software must be compatible with your motherboard hardware. I know "Motherboard Monitor" is a popular temperature monitoring tool, but like i said, it has to support your specific hardware.
might be worth investing in one of those laptop cooling docking stations. at the very least, roll a pencil under the back of the laptop when it's on a tabletop, to create a small cushion of air.