IBM PC 5150, 8088 with 8087 math coprocessor. Later swapped out the 8088 for the NEC V20. "The NEC V20 (μPD70108) was a processor made by NEC that was a reverse-engineered, pin-compatible version of the Intel 8088 with an instruction set compatible with the Intel 80186. The V20 was introduced in 1982,[1] and the V30 debuted in 1983.[2][3]
The chip featured much more than the 29,000 transistors of the simpler 8088 CPU, ran at 5 to 10 MHz[4] and was around 30% faster (application dependent) than the 8088 at the same clock speed, primarily due to faster effective address calculation, along with faster loop counters, shift registers and multiplier." - Wikipedia