The 5310m was enclosed by an aluminum and magnesium case, weighed under four pounds, and was less than an inch thick. HP launched the 5310m in September 2009 as a line of compact mid-range 12" and 13" ProBooks without CD-drive bay. The updated sibling EliteBook line had an additional magnesium frame under screen top lid, the keyboard LED-backlight, the aluminum bottom-cover, the 17" workstation version and the additional security options. The B-series design was updated in 2011 with the Intel-powered 6460b and 6560b, and the AMD-powered 6465b and in 2012 with the Intel-powered 6470b and 6570b, and the AMD-powered 6475b.
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