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Compact silver 1U ATX power supply with rear fan grille and side label

KHACHIMO

KHACHIMO 1U 300W 400W ATX Power Supply SD-3400U

SKU CH-3K29-8TV3A

A 1U ATX power supply rated 300 W with 400 W peak, 80 PLUS Gold efficiency, zero-RPM fan mode and resonant LLC topology with DC-to-DC conversion for clean power and Modern Standby support

  • TypeATX
  • Modern Standby compatible for fast wake times
  • 80 PLUS Gold certified for high efficiency
  • Zero RPM fan mode for silent low-load operation
  • Resonant LLC topology with DC-to-DC for clean power delivery
  • 300 W rated and 400 W peak output in 1U form factor

1U ATX supply for compact builds

The KHACHIMO SD-3400U is a 1U form-factor ATX power supply rated at 300 W continuous with a 400 W peak capacity. It targets builders assembling low-profile desktops, rack-mount servers or space-constrained workstations where standard-height units will not fit. Buyers needing higher sustained wattage for multi-GPU configurations should look elsewhere.

Efficiency and sleep-state limits

An 80 PLUS Gold rating confirms high efficiency at typical loads, reducing waste heat and lowering operating costs over time. Modern Standby compatibility allows the unit to enter and exit low-power sleep states rapidly, but the feature only functions when the motherboard and operating system also support the standard. Systems without Modern Standby firmware will not benefit from the faster wake times.

Cooling behaviour and topology

Zero RPM fan mode stops the fan completely at low and medium loads, delivering near-silent operation during office work or idle periods. Resonant LLC topology combined with DC-to-DC conversion supplies clean, stable voltages and reduces coil whine, though audible noise will return once the fan spins up under heavier demand. The 1U chassis dictates a small fan diameter, so airflow density is higher than in full-height units.

Põhijooned

  • Modern Standby compatible for fast wake times
  • 80 PLUS Gold certified for high efficiency
  • Zero RPM fan mode for silent low-load operation
  • Resonant LLC topology with DC-to-DC for clean power delivery
  • 300 W rated and 400 W peak output in 1U form factor

Tehnilised andmed

TypeATX

Küsimused selle toote kohta

What is the difference between the 300W rated and 400W peak ratings on this unit?

The 300W rating is the continuous power the supply can deliver steadily, while the 400W peak is a short-term limit for brief demand spikes such as startup surges.

What does the 80 PLUS Gold certification mean for daily use?

It confirms the supply meets strict efficiency targets at typical loads, reducing wasted electricity, heat output and fan noise compared with lower-rated units.

How does the ATX form factor affect installation in a 1U chassis?

The supply follows the ATX electrical specification but uses a 1U-height enclosure, so it fits slim rackmount cases while providing standard ATX power connectors.

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