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Alright, so you're building or upgrading a server and need a reliable RAID card.

This is an HP Smart Array P420 controller.

It's an open-box item but in excellent, new condition—basically, it might have been a display unit or something, but it comes with the original accessories.

It's got 512MB cache, supports 6G SAS, and includes the battery backup unit so your data stays safe during a power loss.

The part numbers are 633538-001 and 633542-001, and it's the 631670-B21 model.
It fits into a PCI Express x8 slot.

It handles both internal and external SAS connections.
Good, solid HP gear for your server rack.
4 out of 5