I need help upgrading ram.

Abdalaa1

Prominent
Mar 15, 2017
4
0
510
Hey guys, I want to upgrade my ram from 8gb to 16gb but I don't really which one is the best one to buy and if it would fit. I have 2x4gb ddr3 sticks in my blue spot and 2 black empty slots. The ram I have is in this picture: http://imgur.com/gallery/DZydx
Is it better to buy 2 more sticks of 4gb each or is it better to buy 2x8gb sticks? I don't mind spending the extra money to but the 2x8gb sticks. My motherboard is ASUS MSA97 R2.0
Can you guys please link me something that would fit my pc? Thank you!!