Intel Celeron SL4P3 733MHz 128KB 66MHz 1.7V PIII Socket 370 CPU Processor

Intel Celeron SL4P3 733MHz 128KB 66MHz 1.7V PIII Socket 370 CPU Processor

The Intel Celeron SL4P3 is a 733MHz Socket 370 processor from Intel's late-2000 Celeron lineup, based on the Coppermine-128 core — a cost-reduced variant of the Pentium III architecture. It runs on a 66MHz front side bus with 128KB of on-die L2 cache and a 1.7V core voltage, fitting the Socket 370 FCPGA form factor used widely in Slot 1–to–Socket 370 adapter-equipped systems and native Socket 370 motherboards of the era.

Specifications & What's Included

• Brand: Intel
• sSpec: SL4P3
• Lot/Batch Code: Q045A422-0549
• Clock Speed: 733 MHz
• L2 Cache: 128 KB (on-die, full-speed)
• Front Side Bus (FSB): 66 MHz
• Core Voltage: 1.7V
• Socket: Socket 370 (FCPGA — Flip-Chip PGA)
• Core Architecture: Coppermine-128 (Pentium III core, reduced cache)
• Manufacturing: Malaysia (iMC © 2000 marking)
• Processor only — no heatsink, fan, or retention bracket included

Applications

The Intel Celeron Coppermine-128 series targeted the value desktop PC market from 2000 through the early 2000s, slotting into Socket 370 FCPGA motherboards from manufacturers such as ASUS, Gigabyte, MSI, and Intel itself (e.g., the CA810, CC820, and similar 810/815 chipset boards). Many Slot 1 systems of that era used a Slot 1-to-Socket 370 adapter (PPGA or FCPGA converter card) to accept this processor family. The 733MHz Celeron was a popular budget upgrade option for systems originally fitted with slower Celeron or early Pentium III chips. Today these processors are sought after for retro computing builds, legacy industrial and point-of-sale systems that required a specific Socket 370 chip, and vintage PC restoration projects. The Coppermine-128 core is also notably compatible with a wider range of Socket 370 motherboards than earlier Celerons, making SL4P3 a common spare or upgrade part in the legacy PC community.