Trying to add 8 more gb of ram

shadow118x

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Jul 10, 2014
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Hello, I am a bit confuse about RAM, i am trying to add 8 more gb of ram to my computer which already has 8gb so im adding another 8 to total up to 16. They are all the same ram. I got them today and had no idea what to do so i just tried adding them in the other slots. The computer didnt boot. I know the new ram work because i tried them without my old ram. It booted fine, but when i add my old ram it doesnt boot. I am unsure what to do at this point.
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL , This is the RAM. I have 4 of these.