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Basically. Barton's are the newest core revision of the Athlon XP processor, and they are currently available in 2500+, 2800+, 3000+, and 3200+. Currently, the only 400 FSB processors are a 3000+ and 3200+ model. Be careful when selecting a 3000+ model, though, as there are both 333 FSB and 400 FSB models. Basically, the core is identical to the T-Bred B core, except it has an additional 256K L2 Cache for 512K total.
The differences between the Palomino and T-Bred's is simple, sort of. The Palomino is a 15 nanometer part, whereas the T-bred's (both A and B) and Barton's are both 13 nanometer parts. There are other, more technical differences, but I'm not all that knowledgeable about EE stuff. Because of this die shrink, the processors are able to run at higher speeds, using lower voltage, and producing less heat. For example, a 1700+ Pally runs at a stock voltage of 1.75, whereas a 1700+ T-bred B runs at 1.5-1.65 volts.
As Telexen said, the only technical difference (that I know of)between Tbred A and B's is an added layer of interconnects. Like I said, I'm no EE expert, so I can't tell you exactly what this does for the core, but needless to say, T-bred B's are superior to T-Bred A's.
Considering all of the revisions of Athlon XP's that are out on the market right now, it is very important to know what you are buying. Taking all of this into consideration, if you were to buy a new processor right now, you'd want either a T-Bred B or Barton. The barton's are easy to distinguish, as they are the only models available with 512K L2 Cache. The T-bred B's can be a bit harder, and if you are uncertain, you can either post a link to the item here in these forums, or contact the reseller directly and ask.
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"I was absolutely astounded that something like a Chee-to could become a pop icon," said Evans. "It's international. I've even seen it online on a Russian site."
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