Buying more ram question about compatiability

[TheKaptain]

I bought my pc a while ago when I didn't know too much about what I was doing and didn't take the time to do any research. I used iBuyPower and picked some good parts, its been a couple years and I'm looking to upgrade. I know I'll be getting a 1070, however along with that I would like to upgrade my RAM. Currently running 8GB (two 4gb modules) and have been informed that I should be using four modules since my x99 Motherboard supports it. To me it makes sense to buy two more 4gb modules, to get me to my targeted 16gb, instead of buying a whole new set of four 4gb modules. (Right?) The problem is, iBuyPower does not specify what exact model RAM I currently have (not sure if that matters) so i'm not sure If the RAM I am looking at will be compatible. I do know it is DDR4 at 2400MHz. What else should I be looking for to find out if the RAM I buy will be compatible, or, should I scrap that Idea and buy four new 4gb modules and invest in faster speeds?

tldr; want to upgrade ram to 16gb, currently have two 4gb modules, can support four. Should I buy all new ram, or find compatible ram for my system and add on. If the latter, how can I find out what will be compatible?

 

[Samaratin]

Ok, you could open up your case and look at the stickers on the ram to get more specific info about them. At same time, you can download and run CPU-Z, and within that navigate to the information on memory to get some more info as well. Thing is, RAM can at times be picky when mixing and matching. Sometimes people can mix and match RAM of the same and even different speeds and have it work, and other times it will be nothing but glitches and crashes. The safest thing to do is to buy a "matched" set of sticks that come together. Yes, this will cost you more, but at the same time.. they say time is money, and how much time do you want to spend troubleshooting RAM if you just go with 2 new sticks that may, or may not work with what you already have installed.