Slot 1 - Pentium III B and EB Models

Pentium III B and EB Models

A special series of Pentium III for Slot 1 had an addition to its name (Pentium III EB). The "E" indicates a Coppermine core, and the "B" a 133 MHz FSB. Ironically, no consumer-oriented Intel chipset (except select few i820-based motherboards) officially supports a FSB of 133 MHz. To use this CPU, one must either use the VIA Apollo Pro 133A chipset, an Intel 800-series chipset (which was relatively expensive and often required RDRAM, limiting it to high-end workstations or servers), or the Intel 440BX outside of its specifications (which, on some motherboards, is indeed possibly stable).