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Old 2018-01-05, 01:50   #3
Dubslow
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"Bunslow the Bold"
Jun 2011
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MLucas is indeed CPU-only software. It is designed to be more portable than Prime95/gwnum, to architectures other than x86 (though it does include assembly for some targeted architectures). On x86 it will (more or less necessarily) be slower than Prime95, but on other architectures it is essentially the only choice.

GPU software can be found here, even though it's technically a "hardware" subforum: http://mersenneforum.org/forumdisplay.php?f=92
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