lol i dont think u know enuff about this to be even attempting this... too much thermal grease on a cpu can cause it to flow over the sides of the surface ur working with on the cpu.. and that can cause BIG problems (the silver in the compound acts as a path for the electric currents and siglans to jump of their designated paths... if you dont konw that much about electricity then i dont know where to start with u... the jump in the signals causes a short as the siglans arent using their DESIGNATED paths for travel.. get it?).. and you're SUPPOSED to use rubbing alcolhol to clean off all of the heatpad off of the surface and it any of the thermal grease over flows you are supposed to clean it off as well with rubbing alcohol...
you need the right amount of grease on the cpu.. if it overflows and you keep operating it like that you could be looking at BIG problems in the future... but if you dont want ot listen to me and be ignorant then continue by all means and dont complain about it when something goes wrong
EDIT: oh and btw you wont feel the temperature increase when you put your hand near the mobo because what you;re looking at is the interal temperature the cpu is actually working at... so meaning the temperature that the WHOLE CPU is running at... not the air around it.. and if youve put on too much compoung your heatsink wont be dissipating heat properly and you wont be able to feel any temperature increase around the mobo... but even as a note on top of that... ive built computers for customers with cases that have had very little airflow thru them...(because i know they wudnt be using them for anything extensive).. and most of the times the temperature in side the case has been around 30 degrees celcius... while the cpu has been running at 45-50... the 30 degrees inside the case is very hard to notice just by putting ur finger in tehre and feeling how hot it is
EDIT 2: oh yeah use some common sense.. when you put your hand near the mobo you have already opened the side of the case.. giving the hot air a really big path of getting out of ur case.. leaving the inside of the case at nearly ambient temperatures
EDIT 3: omg i just typed a novel for a reply.. i feel like nubius!