Core 25 MHz
32 Bit Math-Co Processor
4 Giga Byte
The i487 SX was not really a Co Processor. It was a
486 DX processor when installed
disable the onboard SX Processor and take over main operation of
the CPU/FPU. The i487 has one pin more than a normal 486 cpu, so
you need a special socket to install this chip.