Lenovo 4X20F28578 1600W Platinum Hot-Swap Power Supply

Overview

The Lenovo 4X20F28578 is a 1600W 80 Plus Platinum-rated hot-swap power supply designed as a direct replacement or redundancy expansion unit for Lenovo ThinkServer Gen 5 servers. At 1600W output, it covers high-draw configurations — dense storage nodes, GPU-accelerated workloads, or fully populated processor and memory slots — without requiring a chassis upgrade or external power conditioning. Hot-swap capability means failed units can be pulled and replaced under load, keeping the server online during what would otherwise be a service window. The Platinum efficiency rating reduces heat output and power draw at the wall, which matters in co-located or rack-dense environments where cooling and power allocation are constrained.

Compatibility

The 4X20F28578 is designed for Lenovo ThinkServer Gen 5 platforms. Before ordering, verify your specific ThinkServer model's PSU bay specification and wattage requirements against your current configuration — ThinkServer Gen 5 encompasses multiple chassis variants, and PSU slot count, form factor, and power-plane architecture differ across models. This unit is a server power supply replacement part and is not cross-compatible with non-ThinkServer or earlier-generation ThinkServer chassis.

Installation Notes

The unit ships at 2.80 lb and measures 12.00 × 5.50 × 4.00 in — confirm bay clearance before installation, particularly in configurations with cable management arms or rear-mounted accessories that reduce service access depth. Country of origin is Mexico. No tools are required for a hot-swap insertion, but confirm the chassis power plane is in a redundant N+1 state before removing the existing unit to avoid a single-point-of-failure condition during swap.