Matching old and new RAM for a new CPU

Hardware CPU
1

So, since Ryzen 3000 is coming, i’m planing to upgrade to either that or a decent deal on a 9th gen core i7 or so.

I’m currently running a 6th gen core i5. So far, so good. Now the interesting part. Because of prices, i’d like to keep using my current DDR4 RAM. I have a 16G Kit of G-Skill 2133 8G DIMs.
So some questions:

  • Will the 2133 Mhz RAM limit the new CPU’s performance in a meaningfull way?
  • Will adding a different Brand of 2133 RAM (another 16 Gigs) be a Problem?
  • What if you run mismatched RAM Speeds (2x2133 and 2x2666 for example)?

Prices seem to have come down a bit and i’d really like to upgrade to 32G. 16G Corsair LPX Kits seem to run around 70€ here. So, will a cheap 16G 2133 Kit to add to the current one be a solution, or do i have to bite the bullet and just upgrade all of it to 3000Mhz RAM?

2

Mismatching only means that you have to manually input the settings or the sticks will just be at other pairs factory settings

3

Ok, so i COULD run 16G of 3000Mhz Dims together with my current 2133 Kit and they would just both run at 2133? If that’s the case, i just need to figure out, how big the performance impact would be.

4

I think you could just get that system otherwise and then eyeball these sticks