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SSE3, was also known by its Intel code name Prescott New Instructions or PNI is the third extension of the SSE instruction set for the IA-32 architecture. It is a SIMD instruction set.
The earlier SIMD sets, from oldest to newest, are MMX, 3DNow! (used only by AMD), SSE and SSE2.
Intel introduced SSE3 in early 2004 with the Prescott revision of their Pentium 4 CPU. It adds about 13 new instructions to the previous SSE2.
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