Hi Fred
Up till about 6 – 12 months ago AMD CPUs kicked Intel’s Backside (Butt) both in speed and the amount of heat (Lack) produced, however since the release of the Intel Core 2 Duo etc, the situation has reversed (You will find virtually all top end games machines, and those that require fast processing, now have Intel CPUs) with AMD now looking like a Model T, (OK, perhaps a slight exaggeration, but you get the idea) the Intel Core 2 Duo also consumes less power, and consequently produces less heat.
Hope this helps

Bill