 Unlike the earlier models, the T9000 had a true 16 KB high-speed cache (using random replacement) instead of RAM, but also allowed it to be used as memory and included MMU-like functionality to handle all of this (termed the "PMI").For more speed the T9000 cached the top 32 locations of the stack, instead of three as in earlier versions.The T9000 used a five-stage pipeline for even more speed.