the 90nm architecture is the size of the die in the CPU, the size of the die directly affects the amount of wattage the CPU eats, 90nm = 90w = toasty CPU. pentium four prescott's where extremely bad about heat, i believe there die size was 110 or 120 when they canceled them. newer dual core processors use a 65nm architecture, meaning they only eat 65w, they run quite cool because of this, and are becoming ideal for laptop and portable computing usage, they provide some serious computing power to both desktop and notebook users, with low heat generation, and, low power consumption. as a note, the average CPU (77-90nm) produces more heat per square inch than a stove eye, keep in mind, overclocking will produce even more heat, thus, even more cooling is needed, but, when overclocking you also have to realize, you increase the strain on not only your CPU, but your RAM, and system bus, which can effect video cards, PCI devices, and many other things. overclocking isn't a good idea unless you have a really high end system and monitor system stability a lot, stressing a system in the wrong ways is usually quite bad.