Question Mixing Ram Sizes

[PeterT.]

I have a PC with Asus Rog Strix Z370-F Gaming motherboard and VENGEANCE® LPX 8GB (2 x 4GB) DDR4 DRAM 3000MHz C15 Memory Kit.
I am thinking to upgrade the memory.
Can i add the VENGEANCE® LPX 16GB (2 x 8GB) DDR4 DRAM 3000MHz C15 Memory Kit to my build?
If so, am I going to have any decrease in performance?

 

[clutchc]

I can't see why. They are both the same speed RAM and similar make/model/latency. As long as they are paired up per channel properly, it should be fine.

 

[Dark Lord of Tech]

They should run together , but there is always a chance they won't. When specs are close you have a better chance.

 

[RememberThe5th]

Probably without issue.
I've ran 2x2 (1600) and 2x8 (1866) without issue. (Expect it was set to the slowest ram)