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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