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In fact it is Intel i80486DX CPU with different pin layout (in Intel i80487SX NPX socket) and one extra pin assigned to disable the Intel i80486SX CPU. The Intel i80486SX CPU can be removed.:

Manufacturer: Intel
Type: FPU Co-Processor
Introduced: April 1991
Name (codename): 487SX (NPX – P23N)
Code (Copyright): A80487SX (Intel 1989)
Core speed: 15MHz – 25MHz (Low freq. operation at 2MHz)
BUS: 15MHz – 25MHz, 32-bit
Transistors (Die size): 1 200 000 (165mm square)
Technology: 1.0-micron
For CPU: 80486SX
Whetstone FPU: ?MFLOPS
V core (typical): 5V
Power dissipation (min./max.): 0.5W (at 2MHz) – 3.85W (at 25MHz)
Operating temperature (min./max.): 0 – 85°C
Package (Socket): Ceramic PGA-169pin (Socket 1, 2, 3 or OverDrive)
Dimensions: 44.5 x 44.5 x 7mm

Origin: Anthony Conrad (France)

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