Intel Xeon 5120 Dual-Core Processor 1.86GHz 4MB L2 1066MHz FSB LGA771 65W

Dual-Core Server Processor for LGA771 Platforms

The Intel Xeon 5120 is a dual-core server processor built on the 65 nm Woodcrest core. It runs at 1.86 GHz with a 1066 MHz front-side bus and carries 4 MB of shared L2 cache. The LGA771 package drops into Socket J server boards from the dual-socket 5000 series generation.

Two cores execute two threads, and the 65 W TDP suits 1U and 2U rack chassis with modest airflow. The processor supports 64-bit instruction sets and Intel Virtualization Technology. ECC memory support depends on the chipset and board pair, so verify the platform datasheet before deployment.

This SKU ships as a tray processor under Intel MM# 884458 with S-Spec SL9RY. Boxed variants appear under MM# 884536 with order code BX805565120A. Both share the same 1.86 GHz clock, 4 MB L2 cache and 1066 MHz FSB. The tray part carries no heatsink, so pair it with a validated LGA771 cooler rated for 65 W.

The front-side bus moves data at roughly 8.5 GB/s, which matches dual-channel DDR2-533 memory bandwidth on the 5000P and 5000V chipsets. That balance matters on database and file-server workloads where memory throughput limits the core count. Two processors per board give four cores in total on compatible dual-socket platforms.

Installation follows the LGA771 procedure. Align the pin-1 triangle on the processor with the socket corner, lower the load plate and close the retention lever. Apply a thin, even layer of thermal compound to the integrated heat spreader and seat the heatsink. Check the BIOS revision before boot, because early boards may need a microcode update for the 5120.

Monitor the case temperature limit of 65°C during burn-in. Sustained readings near that ceiling point to blocked heatsink fins or failed chassis fans. Clean the heatsink every few months in dusty server rooms. Replace the thermal compound whenever the heatsink is removed.

This processor reached end-of-life status and Intel discontinued servicing. Treat spare units as legacy stock for existing server estates. Confirm the S-Spec code against the board compatibility list before ordering, because later 5100-series steppings changed microcode requirements.

Key Features

• Dual-Core Woodcrest Architecture
  Two cores on a 65 nm die deliver 1.86 GHz per core with a shared 4 MB L2 cache.

• 1066 MHz Front-Side Bus

  • Approximately 8.5 GB/s bus bandwidth
  • Balanced against dual-channel DDR2-533 memory
  • Suits 5000P and 5000V chipset platforms

• 65 W Thermal Design Power
  The low TDP fits 1U and 2U rack chassis with standard front-to-back airflow.

• LGA771 Socket J Package
  The 37.5 x 37.5 mm package installs in dual-socket server boards with a retention lever.

• Virtualization Support
  Intel VT-x allows multiple virtual machines to share the two physical cores.

• 64-Bit Instruction Set
  The processor runs 64-bit server operating systems and memory-hungry applications.

• Tray Ordering Code
  MM# 884458 and S-Spec SL9RY identify this tray SKU for procurement records.

Specifications

What’s in the Box

• Xeon 5120 tray processor

• Protective clamshell packaging

Why Choose This Server Processor

• The 65 W TDP keeps rack power and cooling budgets predictable on legacy hardware.

• Dual-socket boards yield four cores from a pair of these processors.

• A 1066 MHz FSB matches DDR2-533 memory bandwidth on 5000-series chipsets.

• Virtualization support extends the service life of older server estates.

• The LGA771 retention mechanism allows field replacement without board removal.

• Tray packaging suits volume spare-parts stock for maintenance contracts.

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