According to this one lecture the speed ups vary from 1.47x - 13.8x. http://ispass.org/ispass2011/slides/4_2.pdf http://ispass.org/ispass2011/slides/4_2.pdf An

According to this one lecture the speed ups vary from 1.47x - 13.8x. http://ispass.org/ispass2011/slides/4_2.pdf http://ispass.org/ispass2011/slides/4_2.pdf Another set of benchmarks comparing simple strcmp to SSE 4.2: https://www.linkedin.com/pulse/simple-fast-string-comparison-sse42-antonio-costa-aka-cooler- https://www.linkedin.com/pulse/simple-fast-string-comparison...