Hexus.net have a review of the AMD Athlon XP 1800. Snip:
"It's obvious that the new XP range of CPU's are more than your average speed grade increase within a processor family. While they are still Athlon cores at heart and share the same Socket and work on the same motherboards (to a large degree), the new XP CPU's are also a departure from the norm as far as AMD are concerned. With Quantispeed, the new organic package and the new marketing angle, this CPU is very important to AMD. It marks their current CPU flagship, the fastest processor they make and the fastest AMD processor ever outside of their labs."