[Bjork]

If you use 4x 8 GB with single rank sticks or 2x 16 GB with dual rank sticks you'll have 2 ranks per RAM channel, which should give you more FPS (especially min. FPS) in CPU limited games.

I'm not sure, if anyone has tested how much it affects Fortnite though. Not having a reliable way to replicate the same stacked lobby (replay mode does not perform the same as actual games) for comparison certainly makes it difficult to confirm something like a 5% improvement.