Intel "Pentium III class" Celeron 633MHz Socket 370 Processor. Based on the Intel Coppermine core. This FC-PGA ('flip-chip') processor incorporates 128KB Advanced Transfer Cache (on-die, full-speed) level 2 (L2) cache with Error Correcting Code (ECC) and features a 66MHz front-side bus (FSB). S-Spec numbers: SL4NY / SL3VS / SL4PA / SL3W9, and 1.65V to 1.7V Core voltage. Please contact us if you need a specific S-Spec number or voltage.