Sorry for all the questions I've been asking lately...

Is it nessisary to apply thermal paste to the cpu when building?
Are there other uses for thermal paste?
What pastes would you recommend?

Thanks!

yes you need to have it. stock coolers that come with the cpu have it pre applied so there is no need, unless you want to put better stuff on. check out this link, benchmarks on different paste link

Unless your goal is to fry your cpu you have to use thermal paste.

You can use it on the northbridge and southbridge heatsinks. I guess you could eat it as well if you wanted to...

Drummerdude already posted the thermal paste shootout by DaSickNinja.

You do need thermal paste, although with retail chips it comes readily applied.

All I can add to the above is that if you're not overclocking, I don't really think replacing the paste/pad that comes with the chip is necessary. (Because, as was said earlier, Intel and AMD chips usually come with a paste/pad already applied.)

I'm suprised everyone else missed this, but you want thermal grease, not thermal paste. Thermal paste has an adhesive in it and that's probably not what you're looking for.

So will thermal paste be bound to the CPU (or whatever I apply it to) and void its Warranty (or its value for reselling)?

If so is thermal grease removable, and therefore the better option?

I plan to do some slight overclocking (its will be my first) but so much that the cpu would reach too high temperatures.

Should be overclocking a C2D E6300 (1.86ghz) to around 2.6ghz (not too far). But may not depending on pre OC performance, as that will save the warranty.

it wont void any warranties and yes it is removable by just using some rubbing alcohol and a lint free cloth

It is removable yes but in your case thermal grease should be used, the adhesive is unnecessary.

Eh, thermal paste, thermal grease, thermal gel, whatever, its all the same to me. I say thermal paste because... I dunno, i guess i like the word paste better then the word grease.

yes it is generaly disirable to use some kind of t.i.m.
although i have ran an xp2800barton core for around a year
with no t.i.m. and then applied some cheap radioshack stuff
and oc,ed the $hit out of it before

I had a 2800 Barton before that I ran without any thermal grease, and the temps went up to 100c+, but when I forgot grease on my old northwood it wasn't much worse, must have something to do with the heatspreader.

between the physical chip and heat spreader there is thermal pate, which conducts heat over a larger area, providing more contact with the heatsink, but with the barton there in only a small area, the size of the core that is actually making physical contact with the heat spreader so you need that contact to be the best possible one for it to cool efficiently

I've been told they taste great with pop-tarts!!!

If I were mean this would be the "DuH!" question of the month

However Im not so I will say...it is only important if you care about frying your CPU

nah, mayo will do just fine. jell-o too