Question Mixing RAM Sticks With Different Speeds

[Kayo26]

I currently have two slots populated with 2x8GB of Corsair Vengeance LPX 2666Mhz RAM on my Asus Strix Z390-E motherboard. However, I would like to upgrade to the 2x8GB Corsair Vengeance PRO RGB 3200MHz. If instead of upgrading, I add this RAM to my existing 2666MHz sticks, would this cause issued with my build?

 

[kanewolf]

Mix and match RAM is always a gamble. If it runs, it would all run at the lowest common speed. So if the goal is 3200Mhz on the RAM, that won't happen with a mixture.