Vintage Cyrix Cx486DX2-66 Processor66MHz 486-Class CPU — Ceramic PGA — Attached Heatsink — Protective Case

Up for sale is a vintage Cyrix Cx486DX2-66 processor, a distinctive alternative to the Intel and AMD processors commonly found in early-to-mid-1990s 486-compatible computers.

This 32-bit x86 processor operates at 66MHz, using a 33MHz external bus and a 2x internal clock multiplier. It features an integrated floating-point unit, 8KB of on-chip cache, a ceramic PGA package, and an attached green aluminum heatsink.

The processor has been stored inside the protective hinged plastic case shown in the photographs. It has not been installed or tested recently, so it is being offered for vintage computer restoration, parts, experimentation, or collection.

📦 What Is Included

• Cyrix Cx486DX2-66 processor
• Attached green aluminum heatsink
• Protective black plastic storage case with foam insert

Only the processor, attached heatsink, and storage case shown in the photographs are included. No motherboard, cooling fan, manual, software, cables, or other accessories are included.

🔧 Technical Details

• Manufacturer: Cyrix Corporation
• Processor Family: Cyrix Cx486
• Model: Cx486DX2-66
• Rated Clock Speed: 66MHz
• External Bus Speed: 33MHz
• Clock Multiplier: 2x
• Architecture: 32-bit x86 / 486-class
• Package: 168-pin ceramic PGA
• Typical Platform: Socket 2 / Socket 3-era motherboards
• Floating-Point Unit: Integrated
• L1 Cache: 8KB
• Rear Marking: K2LR5333Q
• Copyright Marking: 1993 Cyrix USA
• Cooling: Attached green aluminum heatsink

Motherboard compatibility depends upon socket support, BIOS support, operating voltage, clock configuration, and jumper settings. The heatsink has not been removed, so the complete top-side markings and exact voltage variant have not been verified. Buyers should confirm compatibility with their intended motherboard before purchasing.

⚠️ Testing and Condition

This processor has not been installed, powered on, or electrically tested recently. Its functional condition is unknown, and it is therefore listed under ’s For parts or not working condition category.

• No POST test has been performed.
• No operating-system or benchmark testing has been performed.
• The heatsink has not been removed.
• The pins appear generally straight in the photographs but have not been individually measured or inspected under magnification.
• The processor, heatsink, case, and foam may show ordinary cosmetic wear, dust, marks, or aging from storage.

Please review all photographs carefully. They show the exact processor and storage case the buyer will receive and form an important part of the condition description.

📦 Shipping & Packaging

The processor will remain secured inside its protective plastic case. The case will be enclosed in anti-static protective material, cushioned carefully, and packed inside a sturdy outer shipping carton.

Free shipping, tracking, and insurance are included. Shipping will be provided through UPS Ground or USPS Ground Advantage, depending upon the destination.

🏪 Check Out Our Store!

We sell a wide variety of vintage computer hardware, electronics, and unusual collectibles. Please take a look at our other listings to see what else we have available.

Everything comes from a smoke-free, pet-free home.

❓ Have Questions?

Please contact us before purchasing if you need an additional photograph, visible component marking, or physical measurement. We are happy to clarify anything that can be determined without removing the heatsink or installing the processor.