I have a XP1900 which I believe runs at 1.6Ghz, I have now also a XP2400 which runs at 2.0Ghz.
Am I right in assuming the 2400 is a worthy upgrade to the 1900 and the Palomino/Throughbred issue is confusing also.

Which chip is which. I know the XP2400 has a 256K L2 but not sure about the XP1900.

Apologies for ignorance.