Replace Power RPSU-ATX-300-12E-D 300W ATX power supply

Replacement for Legacy ATX Units

This Replace Power unit delivers 300 watts of ATX power and is built to replace older Bestec, HP, Hipro, Delta and eMachine supplies. It fits systems that originally shipped with 250 watt or 300 watt models and need a direct swap without rewiring. The reduced depth of four inches helps it sit in tight chassis where standard units foul drive cages or motherboard headers. Builders restoring vintage office PCs or compact workstations will find it a straightforward drop-in.

Built-In Adapter and Protection Suite

A single 20+4 pin ATX connector covers both 20 pin and 24 pin motherboards, while one P4 12 volt four-pin, three SATA 15-pin, three LP4 four-pin and one floppy four-pin connector handle drives and peripherals. The supply runs on 110 to 260 volt AC input with a manual switch and includes over-current, over-power, over-voltage and short-circuit protection. One fan cools the unit across an operating range of zero to fifty degrees Celsius at full load.

When the Upgrade Makes Sense

This model replaces the exact part numbers listed in the compatibility table, so the jump is worth it when your existing supply has failed or when a 250 watt unit cannot sustain the rail currents your hardware now demands. It is not for builders who need more than 300 watts total, who require PCIe power connectors for discrete graphics, or who need modular cabling for a modern enthusiast build.