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The 386SX was a 16-bit data bus, the 386 was retroactively labelled 386DX to differentiate it. The 486SX and 486DX were the math co-processor variants of the 4
by sageikosa 13y ago
The 386SX was a 16-bit data bus, the 386 was retroactively labelled 386DX to differentiate it.
The 486SX and 486DX were the math co-processor variants of the 486, and they weren't originally "deliberately" blown; they just didn't pass QC and were disabled. Later variants just removed the sections for the FPU from the die.