Tom's Hardware Guide CPU Guide: AMD Turns Up The Heat: Athlon XP 1900+ - A New Battle Front: Athlon XP 1900+

Summary:
AMD puts the pedal to the metal! The new Athlon XP 1900+ (clocked at 1600 MHz) pummels the more expensive Intel Pentium 4/2000 in most of our benchmark disciplines. It beats the P4's complicated architecture, proving that it pays to have a good conventional CPU design. In the end, only the results count!