The dx didn't have an FPU either - the difference was the size of the data bus (sx had a 16 bit data bus, dx was 32). It was the 486 where the sx/dx notation in

The dx didn't have an FPU either - the difference was the size of the data bus (sx had a 16 bit data bus, dx was 32). It was the 486 where the sx/dx notation indicated floating point support.