But as I started testing some of the workloads I was mentioning earlier, I realized that I had two unused DIMM slots that can be put to work, so I got the exact same memory that I first put in the machine, coming up to a total of four 16GB sticks. Motherboard with AIO cooler connected to CPU and RAM sticks lit up. Close up of motherboard with AIO cooler connected to CPU and RAM sticks lit up.