486/50

486/50

The designation of CPU speed for a 486. The second number was the clock rate: 486/50 meant 50 MHz. CPUs beyond 33 MHz may have had different internal and external speeds as noted in the following table. The internal clock speed was the rate at which the CPU processed (calculated, compared, etc.). The external clock speed was the rate at which it communicated with RAM and external bus.

     486 Type      Internal     External

     486/25        25 MHz        25 MHz
     486/33        33 MHz        33 MHz
     486/50        50 MHz        50 MHz
     486/50DX2     50 MHz        25 MHz
     486/66        66 MHz        33 MHz
     DX4/75        75 MHz        25 MHz
     DX4/100      100 MHz        33 MHz