Is my third and different model ram bottlenecking my performance?

I had 2x4 GB, one of them died and I bought another 2x4 gb ram at a different speed. Here is the single one I have: https://imgur.com/a/Gyl7OQI

My last 8 GB of ram is two of these: https://imgur.com/a/Gyl7OQI

Is it ruining my pc performance? I have constant stutters in PUBG (with a GTX 970 and i5-4670k) and read that it could be related to ram. Am I better off running 2 of the same RAM modules at 8 GB, or all 3 at 12 gb? Running Windows 10 64-bit.

Submitted April 29, 2018 at 10:52PM by ringadu https://ift.tt/2r9PMAE