Description
Intel Pentium MMX 166MHz CPU SL2HU A80503166 Socket 7 BP80503166
The Intel Pentium MMX 166MHz (sSpec SL2HU, OPN A80503166/BP80503166) is a Socket 7 desktop processor from Intel's first-generation MMX product line. It runs at 166MHz on a 66MHz front-side bus and operates at a 2.8V core voltage, distinguishing it from earlier non-MMX Pentium chips that ran at 3.3V. The MMX instruction set added 57 new SIMD instructions and doubled the L1 cache to 32KB, providing meaningful improvements in multimedia and floating-point-intensive workloads compared to the original Pentium.
Specifications & What's Included
- Manufacturer: Intel
- Processor: Pentium with MMX Technology
- Speed: 166 MHz
- Front-Side Bus: 66 MHz
- Core Voltage: 2.8V (split-voltage / dual-voltage)
- Socket: Socket 7 (CPGA, 296-pin ceramic PGA)
- L1 Cache: 32 KB (16 KB instruction + 16 KB data)
- Instruction Set: x86 + MMX (57 SIMD instructions)
- Manufacturing Process: 0.35 micron
- sSpec Number: SL2HU
- OPN / Part Number: A80503166 / BP80503166
- Package: Ceramic PGA, purple substrate
- Included: CPU only — no heatsink, fan, or retention bracket
Applications
The Pentium MMX line was Intel's mainstream desktop processor of the mid-to-late 1990s, targeting PC platforms running Windows 95, Windows 98, and MS-DOS. Socket 7 was the standard CPU socket of that era, supported by motherboards from manufacturers including ASUS, Gigabyte, MSI, and Abit, among others. The MMX variant was particularly relevant for multimedia workloads — audio/video playback, software MPEG decoding, and early 3D gaming — giving it a real-world performance edge over the non-MMX Pentium at the same clock speed. Today these processors are sought after for retro PC builds, vintage computing collections, and legacy system maintenance where an original Socket 7 CPU is required. The SL2HU stepping is one of the more common and well-regarded revisions of this chip.
This Intel Pentium MMX 166MHz processor (SL2HU / A80503166) has been tested at our facility and is in good working condition. The ceramic package shows surface discoloration and light contamination consistent with age, as visible in the photos. A small chip is present on one edge of the ceramic package (visible in the side-profile photo) but does not affect the pins or die. All gold PGA pins appear straight and intact. No heatsink, fan, or retention bracket is included — CPU only. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Intel |
Model: |
Pentium MMX 166MHz |
MPN: |
A80503166 |
Secondary Model: |
BP80503166 |
SKU: |
41747 |
Type: |
Desktop Processor / CPU |
sSpec Number: |
SL2HU |
Processor Speed: |
166 MHz |
Socket Type: |
Socket 7 |
Core Voltage: |
2.8V |
Instruction Set: |
MMX |
Number of Cores: |
1 |
Bus Speed: |
66 MHz |
Cache L1: |
32 KB (16 KB instruction + 16 KB data) |
Manufacturing Process: |
0.35 micron |
Country/Region of Manufacture: |
Malaysia |
Form Factor: |
CPGA (Ceramic PGA) |
Compatible With: |
Socket 7 motherboards (Intel, ASUS, Gigabyte, MSI, etc.) |
Seller Notes: |
CPU only; no heatsink, fan, or bracket included. |
Condition Notes: |
Intel Pentium MMX 166MHz SL2HU has been tested and is in good working condition. Ceramic package shows age-related discoloration and a small edge chip (cosmetic only). All gold PGA pins are straight and intact. CPU only — no heatsink or fan included. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
