Streaming SIMD Extensions Katmai New Instructions KNI SSE <architecture> (SSE) {Intel Corporation}'s {floating point} {SIMD} extention of their {Pentium} {microprocessor} architecture. SSE was formerly know as KNI (Katmai New Instructions). It was introduced with the {Pentium III}. Intel Pentium III (http://developer.intel.com/design/pentiumiii/prodbref/). ipoem (http://ipoem.com/technology/Docs/pentium4.html). (2003-07-13)