There are PCIe x16 cards that let you plug in 4 m.2 SSDs, so theoretically you could make a system with 4 times as many SSDs as you have x16 slots. The overhea

There are PCIe x16 cards that let you plug in 4 m.2 SSDs, so theoretically you could make a system with 4 times as many SSDs as you have x16 slots. The overhead of RAID might nullify the performance gains of NVMe though, as this benchmark of 3 NVMe drives shows: https://www.pcper.com/reviews/Storage/Triple-M2-Samsung-950-Pro-Z170-PCIe-NVMe-RAID-Tested-Why-So-Snappy/Preliminary-Resul https://www.pcper.com/reviews/Storage/Triple-M2-Samsung-950-... It delivers similar performance to a SATA SSD array I built years ago for bandwidth (not sure about IOPS though).