Which CPUs does the X8DTE-F support?

It takes two Intel Xeon 5500 or 5600 series processors in LGA1366 sockets. Both sockets must be populated for full memory and PCIe access, though it can run on one CPU.

What kind of memory does it need?

DDR3 in twelve DIMM slots. Registered ECC modules are required to reach the full 192GB; unbuffered memory works only in limited configurations.

It is extended ATX, so it needs a full-tower case with E-ATX mounting and a power supply with the right server connectors. Check standoff layout before buying.

Does it have remote management?

Most revisions include an IPMI management port for remote console and power control. Confirm the specific board revision has the dedicated LAN port before relying on it.

Is it worth it over a newer single-socket board?

Only if you already own LGA1366 Xeons and DDR3 ECC memory. A modern single-socket board is quieter, cooler and faster per watt, but costs more for the same core count.

Typically just the board, and sometimes an I/O shield. Heatsinks, CPUs, memory, cables and brackets are usually sold separately, so check what the listing includes.