Can I use standard DDR3 ECC RAM in a Dell PowerEdge T320?

Yes — the T320 uses standard DDR3 ECC, but it’s picky about rank (single vs dual) and speed. You can’t just throw in any old stick. The server accepts both UDIMMs and RDIMMs, but mixing them won’t work, and you can’t mix single- and dual-rank DIMMs in the same channel. Speed should be matched at 1333MHz or 1600MHz, and the system will clock all RAM down to the slowest stick. Save yourself a headache: buy a matched kit from a reputable reseller or check the Dell compatibility matrix.