The ThinkCentre M75q Gen 2 locks RAM speed at 3200MHz with two sticks

The Lenovo ThinkCentre M75q Gen 2 runs DDR4 memory at 3200 MHz when both slots are populated — that’s its ceiling. If you install slower RAM, say 2666 MHz, it’ll work but at the slower speed. Faster RAM like 3600 MHz gets downclocked to match. The controller calls the shots, not the stick labels.