Power Supply

Server power supplies are specified by wattage, redundancy configuration, and efficiency rating. Redundant configurations (commonly 1+1) let a server keep running if one PSU fails, which is standard for production servers and effectively mandatory for anything hosting customer-facing workloads. Efficiency is rated under the 80 PLUS programme (Bronze through Titanium) — higher ratings mean less power wasted as heat, which matters both for running costs and for cooling load in a dense rack. When replacing or upgrading a PSU, match the exact form factor and connector pinout for your chassis; server PSUs are rarely interchangeable across different server platforms or even across generations from the same vendor.