KHACHIMO PSU for FSP 1U -5V 300W 350W 601U 601UA power supply

Replacement PSU for 1U FSP Units

This power supply replaces the FSP300-601U and FSP350-601UA models in 1U server chassis. It delivers ATX-standard output with a modern standby implementation for rapid wake-from-sleep response. The unit is brand new and built for systems that require the specific -5V rail found in these legacy platforms. It targets administrators maintaining existing rack infrastructure rather than new builds.

Capacity and headroom for 300W and 350W loads

Rated outputs of 300W and 350W cover the original specifications for the supported FSP models. The 80 PLUS Gold certification ensures high efficiency across typical server workloads, reducing waste heat and fan activity. Headroom exists for standard configured systems, but heavily expanded drive arrays or add-in cards may exceed the rated ceiling. Builders needing more than 350W of continuous DC power must select a different form factor.

LLC resonant topology with DC-to-DC conversion

The resonant LLC primary stage combined with DC-to-DC secondary regulation provides tight voltage regulation and low ripple. This topology also enables the zero-RPM fan mode at low and medium loads for near-silent operation. It is the defining electrical characteristic that determines compatibility with the target FSP platforms. Systems requiring a different internal architecture will not match this design.