08-22-2012 06:13 PM
The laptop supports up to 8GB of DDR3 RAM at 1333Mhz.
I recommend Corsair memory modules:
but Crucial, Samsung or Kingston are also good products..
How to is here: http://h10032.www1.hp.com/ctg/Manual/c02753308.pdf
HP ProBook 640 Sabayon LInux
HP Touchpad provided by HP
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08-22-2012 06:14 PM
Your notebook supports a maximum 8Gb of Ram ( 2 x 4Gb Modules ). A suitable upgrade can be found Here.
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Microsoft MVP - Windows Insider