Just spotted this new tool at NforcersHQ.com!

Matt Barney has created a pretty nice utility in which the main purpose is to calculate AMD PR ratings for CPU's from Morgan, Palomino, T-Bred, Barton and AMD64 processors, and fully supports overclocked front side bus speeds with unrivalled accuracy for all modes. Added is a CPU stepping decoder which lists all known details about your specific CPU, a full list of stock AMD AthlonXP and Athlon64 settings so you can see how much performance you're gaining from that higher FSB!

uAMDtool CPU Utility Mirror at Guru 3D