when I was mentioning a Thermocouple
i was refering to the electronic thermometers you can attach to devices other than your motherboard, such as your video card, memory and hard drive. Something like this thingy
as a quick example. Like I was saying, if you are going to start playing around with overclocking your hardware at all, temperature management should be one of your biggest concerns. Not only just to keep your hardware from frying itself, but quite literaly, the cooler the hardware is, the faster it will run. I'll have to see if I can find the link to a guy who piped liquid nitrogen into his box... people get crazy with this sort of thing!