Dell GP703 Optical Drive SATA Cable
My R710 listing didn’t specify if it came with an optical disk drive or not, so I played it safe by buying the specific cable needed. Since most servers don’t have the same kind of PSUs and cabling, any old SATA cable wouldn’t have done. It was pretty cheap (listing here), and even if I ended up not needing it – I did – it would have been a nice insurance policy.