Can I upgrade ram on a Lenovo B570?

Hi, I'm wondering if I can upgrade my Lenovo B570 RAM from 4gb to 8gb ram. According to crucial, I'm able to upgrade to a maximum of 8gb of ram. But I came across 2 different types. Here they are:
4GB DDR3 PC3-12800 Unbuffered NON-ECC 1.5V 512Meg x 64
and
Crucial 4GB Single DDR3 1600 MT/s PC3-12800 CL11 Unbuffered UDIMM 240-Pin Desktop Memory Module CT51264BA160B
I'm wondering which one I should click on. The website for number 1 is
http://www.crucial.com/...reId=10151
the website for number 2 is:
http://www.amazon.com/...B006YG89Q6
Please tell me which one! It will mean alot