Mixed-profile cards in one riser. That's the headache. You've got a compact NIC that needs a Low Profile slot and a full-height HBA or GPU that needs clearance above the PCB — both in the same Riser 1 position on your ThinkSystem SR630 V2 or SR645. This OEM option kit handles both. PCIe Gen3, x16/x16 split, one LP slot and one FH slot side by side. No mixing and matching third-party risers. No wondering if the bracket's going to hit the power supply. Seat it, install your cards, done. Add to cart and get that build back on schedule