SSE4

SSE4 instruction set consists of 54 instructions that improve performance of media data manipulation and text processing. The first 47 instructions from the SSE4, called SSE4.1, were introduced in Intel Penryn core on January 7th, 2008. Support for remaining 7 instructions, or SSE4.2, was included into Nehalem core.

At this time (November 2008) there are no AMD processors supporting SSE4 instructions.