Is the Dell CFN72 compatible with my Dell server or workstation?

It is a 2.5-inch SATA 6Gbps drive, so it fits any bay that takes that form factor. Match the CFN72 part number against your system's service documentation to confirm Dell lists it for your model.

How fast is it compared with a modern SATA SSD?

It uses older MLC NAND and a SATA 6Gbps interface, so expect it to trail current TLC SATA drives and fall well behind NVMe. It is fine for boot and general storage, not for heavy sequential workloads.

For an OS and a handful of applications, yes. For game libraries, media or virtual machines, it fills up quickly; plan a second drive or a larger capacity.

What is MLC NAND and does it matter?

MLC stores two bits per cell, which gives better write endurance than TLC but at higher cost per gigabyte. For light use the difference is minor; for heavy writes it is a plus.

What comes in the box?

The drive itself. Dell OEM parts typically ship without cables, brackets or cloning software, so check that your bay and cabling are already in place.