Intel Celeron 533
The fastest black PPGA Celeron available but unfortunatly still with a slow 66MHz front side bus (FSB). When the 333MHz Celeron was new, the 66MHz FSB was adequate. I guess the Celeron in the range of 500 - 550MHz could benefit nicely from a 100MHz front-side-bus but that's how thing go with a budget class CPU . Intel can't risk having their budget-line competing with the high-end line.