AMD Am486 DX2/66

A D-stepping of the original AMD Am486DX2/66 with package number 24361 made by Kyocera. The first models didn't have any additional numbers in it's model name. Later AMD made different versions which had write-back cache and a slightly modified chip due to a lawsuit with Intel.

I have different versions of the Am486DX2/66 in my collection.
Am486DX2/66 E6 stepping with package number 24361 made by Kyocera
Am486DX2/66N E6 stepping with No-ICE microcode and package number 25220 made by Sumitomo
Am486DX2/66N E6 stepping with No-ICE microcode and package number 25220 made by Kyocera
Am486DX2/66NV8T A stepping with No-ICE microcode and package number 25220 made by Kyocera
Am486DX2/66SV8B C stepping with No-ICE microcode and package number 25398 made by Kyocera

The V stands for 3,3V and the 8 for 8KB L1-cache. The T and B indicate if write-through or write-back is supported. Write-back cache is backwards compatible with write-through. Write-back offers better performance. All models with S are Enhanced Am486 CPU's that have several power-saving options (if the motherboard supports this). Also all models with S are equipped with the No-ICE (In-Circuit Emulation) microcode modification. All versions with N are also No-ICE. AMD was forced to remove Intel's ICE due a lawsuit.

Keep in mind that late models of the Enhanced Am486 don't include the S-marking despite being Enhanced.

A similar processor has been benchmarked! Click here to see this processor and the benchmarks.