Hello, It's been years since I made a post. I hope you guys are doing well. I have a situation that I've never had before. I usually buy and replace my memory but in this case, I currently have 16GB 3000mhz cl15, and I just bought an additional 16GB but this time it's 3600mhz cl18. Should I use my new memory along with my old one? or should I just replace them?