1992 Vintage Intel Overdrive DX20DPR66 SZ904 Ceramic Gold Plated CPU Collectible For Sale
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The Intel OverDrive DX20DPR66 SZ904 V3.0 is a 486-class processor designed as an upgrade for existing 486-based systems.
Rarity and Limited Production
Condition: Excellent, Collectible, Owned for teaching led-lecture classes for demonstration purpose.
Brand: Intel
Processor Type: 80486 OverDrive (based on Intel 486 DX2 technology)
Frequency: 66 MHz
Bus Speed: 33 MHz
Clock Multiplier: 2x
Socket: PGA168 (Pin Grid Array, 168 pins, ODPR variant for direct replacement in 486SX/DX sockets)
Microarchitecture: i486
CPUID: 435 (for SZ904 and SZ935 variants)
Manufacturing Process: 0.8 micron
Data Width: 32-bit
Floating Point Unit (FPU): Integrated
Level 1 Cache: 8 KB, 4-way set associative unified code and data cache
Physical Memory: Supports up to 4 GB
On-chip Peripherals: Memory management unit
Additional Features:
Built-in voltage regulators for compatibility with older systems
Write-back cache (improved over write-through cache in standard 486 processors)
Fanless operation with a built-in heatsink
Designed as a drop-in replacement for 486SX or DX processors, often not requiring motherboard jumper changes
This processor was intended to upgrade 33 MHz 486 systems to 66 MHz, effectively doubling the performance to approximate Pentium-level speeds for certain tasks.
