I have 16.0 GB of RAM but it only lets me use 7.97GB

[zebanovich]

See a list on asrock site for your motherboard:
ASRock > 970M Pro3

Sort the list according to size, you probably want either 2x8 GB or 1x16 GB dual channel stick with low latency.
Your CPU: AMD FX-8120 Specs | TechPowerUp CPU Database

HyperX looks fine, but if you want to save some money, see of which brands are your current sticks, then find exact same sticks on that list (including same timings)

 

[domash]

Thanks, if I purchase two 16 GB sticks, can my processor handle it?

 

[zebanovich]

Sure, it can handle up to 64 GB, but to play games you don't need more than 16gb, except if you plan to play ultra large maps in some strategy games or if you're graphics designer, game developer or something like that.

 

[flavallee]

You have more graphics card than you need for that processor, so the graphics card may not run at its full potential.

I agree with zebanovich. 16 GB of RAM is sufficient.

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[Couriant]

I left my note up and looks like there has been more posts I was going to mention that in your screenshot of the SPD tab you show both different speed and different ranks. Memory is not as interchangeable as we would want, plus the higher speed would be slowed to match the lower speeds.

As mentioned, you should always buy the same brand, model, and in pairs.

Good luck!

 

[domash]

Thank you, I will look around. THANK YOU ALL FOR YOUR HELP! If this doesn't work, I'll be back