Is G.Skill Ripjaws RAM compatable with my Motherboard?

castace

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Mar 14, 2015
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Hi. I recently bought 2x4GB sticks of G.Skill Ripjaws RAM but when I plug it in it won't work. I have 4 RAM slots, 2 are filled with other RAM (The generic stuff that comes with an ASUS CM1855-CA003S Computer AMD FX-8120, 10GB RAM Eight-Core CPU. I've tried plugging it in with the other RAM and without the other RAM but it doesn't work. Is it compatable with my motherboard. If it is an I have to fool around with the timings or whatever, can you tell me, in great detail, how to do it? Also, would I be able to keep the other 2 sticks of DDR3-1600 MHz. Also, when I go into system it says that I have 10.0 GB of RAM but only 5.xx GB is usable. Is there any way to diagnose what's going on and how to fix it? I would greatly appreciate any help. Thanks in advance.

Here is what CPU-Z says under the "Mainboard" heading:

Manufacturer: ASUSTeK COMPUTER INC.
Model: CM-1855 Rev. 1.xx
Chipset: AMD RD9x0 Rev: 02
Southbridge: AMD SB910/950 Rev: 40
LPCIO: ITE IT8721

BIOS

Brand: American Megatrends Inc.
Version: 1501
Date: 08/20/2013

If you need any more info just let me know, I'd like to get this answered.

As for the brand of RAM, it's the brand that comes pre-installed with the CM-1855 FX-8120 System from ASUS. The RAM is Dual-Channel 1600MHz RAM, 2x4 GB and 1x2GB sticks. According to CPU-Z it's manufactured by "ASint Technology" "PC12800 (800MHz)" and "DDR3"