See if this helps....All are really athlons anyway...
athlon (athlon classics) are slot version of the chip and spanned from 600-1000mhz...L2 cache didn't run at full processor speed (I think like 2/5)
tbird was the next derivative...It change to a socket form and l2 cache ran at full speed. You then have "b" chip with front side bus of 200mhz and the "c" chip that has 266 front side bus...tbirds range from 650-1400mhz in 200fsb...range 1000-1400mhz in 266fsb's...durons are similar in size and shape yet have 1/2 of the l2 cache and run at a slighltl less core voltage...
Palomino is the "athlon xp" and "athlon mp" and "athlon 4"....They are all the same...They are socket a chips with built in sse encodings, enhanced thermal device (really no mobos taking advantage of), hardware prefetching, advanced branch prediction, and on top of that consumes less power and thus generates lees heat...xp is the home pc market code name...mp is for business computers and stands for amd approved for multi=processor platforms...athlon 4 id code name for the mobile chip in laptops...same bus speed as tbirds
The last two are fully compatable on most mobos kt133 and greater....
If I left something out someone can add...