Intel Pentium 4 520J SL7PR 2.8GHz 1MB 800MHz Socket 775 LGA775 CPU Prescott

Intel Pentium 4 520J SL7PR 2.8GHz 1MB 800MHz Socket 775 LGA775 CPU Prescott

The Intel Pentium 4 520J (S-Spec SL7PR) is a single-core desktop processor built on Intel's 90nm Prescott core and designed for Socket 775 (LGA775) motherboards. Running at 2.8GHz with an 800MHz front-side bus and 1MB of L2 cache, it was part of Intel's mainstream Pentium 4 5xx series targeting the desktop PC market of the mid-2000s. The 520J designation indicates support for Intel's Execute Disable Bit (XD/NX) security feature, distinguishing it from the non-J 520.

Specifications & What's Included

• Processor: Intel Pentium 4 520J
• S-Spec: SL7PR
• Part Number: JM80547PG0721M
• Processor Core: Prescott
• Clock Speed: 2.80 GHz
• Front Side Bus: 800 MHz
• L2 Cache: 1024 KB (1 MB)
• Socket Type: Socket 775 / LGA775
• Package: 775-land FC-LGA4
• Number of Cores: 1 (single-core)
• Manufacturing Technology: 90 nm (0.09 micron)
• Core Voltage: 1.287 – 1.4 V
• Execute Disable Bit (XD): Yes (indicated by "J" suffix)
• Previous Stepping: SL7J5
• What's Included: CPU only — no heatsink, fan, or retention bracket

Applications

The Pentium 4 5xx series targets Socket 775 motherboards using Intel's 915, 925, and similar chipsets from the 2004–2006 era — a generation that saw the transition from Socket 478 to the LGA775 platform. These processors are used in mid-2000s desktop PC builds and upgrades, legacy workstation restorations, and compatibility testing for period-correct systems. The Prescott core introduced a deeper pipeline and higher clock speeds, and the LGA775 platform remained Intel's mainstream desktop socket through the Core 2 Duo generation, so Socket 775 boards are still common in vintage and budget PC contexts. The 520J is a direct drop-in upgrade path for any Socket 775 board that supports 800MHz FSB and 90nm Prescott CPUs.