Intel Pentium II SL2S7 400MHz Slot 1 CPU 512K Cache 80523PY400512

Intel Pentium II SL2S7 400MHz Slot 1 CPU 512K Cache 80523PY400512

The Intel Pentium II SL2S7 is a 400MHz Slot 1 desktop processor built on Intel's P6 microarchitecture and manufactured in Malaysia. It uses the SEC (Single Edge Contact) cartridge form factor that slides into an SC242 Slot 1 connector on the motherboard. This unit carries the full-speed 512KB L2 cache running at half core speed (200MHz), which was a distinguishing feature of the Pentium II line over competing budget processors of the era. It is identified by OEM/tray code SL2S7 and full MPN 80523PY400512.

Specifications & What's Included

• Processor: Intel Pentium II
• S-Spec: SL2S7
• OPN / MPN: 80523PY400512
• Secondary Part Number: 98320006-0103
• Core Clock Speed: 400 MHz
• Front Side Bus (FSB): 100 MHz
• L2 Cache: 512 KB (on-cartridge, runs at 200 MHz)
• Socket / Interface: Slot 1 (SC242)
• Form Factor: SECC2 cartridge
• Country of Manufacture: Malaysia
• Includes: Integrated heatsink and fan assembly

Applications

The Pentium II 400MHz (SL2S7) was introduced in 1998 as Intel's mainstream desktop performance processor. It was designed for Slot 1 motherboards built around Intel's BX, LX, GX, and ZX chipsets — common boards from Asus (P2B series), Abit (BX6), Gigabyte (GA-6BX), and MSI among others. The 100MHz FSB of the 400MHz part made it the top of the original BX chipset lineup at launch, and the BX chipset's stability made it one of the most popular platforms of the late 1990s. Pentium II systems were widely used in office workstations, CAD stations, and home desktop PCs running Windows 95, Windows 98, and Windows NT 4.0. Today these processors are sought after for vintage PC restoration, period-correct retro computing builds, and legacy software compatibility testing on late-1990s hardware.