HP - Compaq ProBook 4520 s: HP - Compaq ProBook 4520 s compatible RAM upgrades

Hi guys! I bought the HP - Compaq ProBook 4520 s and I plan to upgrade my memory (4 GB of ram).  Is PC3-12800 unbuffered NON - ECC 1.35v or PC3-10600 1333 - PC3 compatible? Can anyone suggest me what is the most compatible? Thank you!

Supports up to 8 GB of system RAM PC3-8500, 1066 MHz, DDR3

I guess you want to upgrade to 8 gigs. The specified memory modules are:

4 GB (PC3-10600 1333 MHz, DDR3) 599092-001

http://www.Amazon.com/HP-VH641AT-4-GB-DDR3-PC3-10600/DP/B0030L3B8E/ref=sr_1_1?ie=UTF8&QID=1451132539&SR=8-1&keywords=599092-001

It does not speed up the system to install memory 1600 mhz and your laptop requires no 1.35 volts. The DDR3-1600 (PC3-12800) might work, but you're better off buy the modules specified or as close to them as you can find.

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