how many volts DC(think of a Walkman running on 3 volts mp3 players on 1.5- 6 depending on company) the cpu runs on. This does not mean allot....but lower voltage CPUS "tend" to run cooler...
Like it says....it has to go with how hot they CPU should run at the MAX.... it will be lower...they sometimes also refer to max Case Temp... as a indication of what the stock cooler can handle inside the case. The way i see it is...if it don't crash...then its all good....on 939 and AM2 you will see like 30's(maybe even 20's) idle...and 50(if even that) at the most....well at least for most ppl.
This describes how much heat the CPU lets off... heat is just a by-product of electronics.... when you take in the millions of transistors in a cpu its gonna make some heat.(mine is rated at 89 for one cpu so for 2 it ain't bad and is at 37 right now...about 50-55 load on a hot day under load) When you can look for the lowest THERMAL POWER...but as long as you have a well ventilated case it is not going to be an issue.... CPU's just get better and better in that way....
ADA3800IAA5CU - this is like the standard CPU 89 watts of heat...easy to take care of with the stock heat sink....
ADO3800IAA5CU - This is made for smaller cases(i think they call this EE, Energy Efficient) and people that want low heat...
ADD3800IAT5CU- this is there (corect me if i am wrong someone) EE SFF “Energy Efficiency Small Form Factor" CPU - made to run in the smallest of cases and runs so cool so that they will still be quiet and be able to put up with the poor ventilation of such a case...
I hope this helps