A few years ago I bought a kit of 2 X 8GB 3000 MHz, TeamForce Vulcan Z red ram. Now I want to add another kit of 3000/3200 (I know the speed will be reduced to 3000) but I can only find this kit with a grey heat spreader. I know DDR4 can be quite temperamental and for the best chance of no problems etc. with 2 kits is for the speed, memory chips and timings to coincide. I'm not sure if this will make a difference as I do not know the underlying specs (what memory chips they used etc.). Do you happen to know this?