@dvl R730xd has a nvme u.2 backplane converter kit, not sure if this also fits the R730 (non xd) chassis.> Dell P31H2 NVME SSD PCIe Extended Controller and cables, adds u.2 support to the last 4 drive slotsAlternately, use a dual or quad m.2 to pcie slot adapter.- https://www.amazon.com/10Gtek-B09NKTYFHX/dp/B09NKTYFHX/- https://www.amazon.com/Removable-Enclosure-Expansion-ExpressSlot-MB204MP-1B/dp/B0DP1NGRLG/