No, their mainframes use the zArch which goes back to the System/360 from 1964. https://en.wikipedia.org/wiki/Z/Architecture https://en.wikipedia.org/wiki/Z/Ar

No, their mainframes use the zArch which goes back to the System/360 from 1964. https://en.wikipedia.org/wiki/Z/Architecture https://en.wikipedia.org/wiki/Z/Architecture IBM sells huge servers with POWER architecture CPUs but they are not what people are referring to when they talk about IBM mainframes.