Moved to PCIe based Optane and NVME storage with the dual Xeon CPU, because I can attach them directly to the CPU of my choice, bypass the chipset, use more capacity, etc.
The P4800X sounds better than the 900P! And the PCIe version sounds better than the M.2 version (P4801X).
I can only imagine what an externally powered PCIe P4800X with an upgraded OCXO clock could do!