Site updated: 19.7.18

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I'd been debating a new machine for a while and had always liked the idea of a quiet machine, so kept looking at the Quiet... (21st March 2018 via Trustpilot)
HFX 547 External Power Supply EF28-B 280W for Mini

mCubed HFX 547 External Power Supply EF28-B 280W for Mini

The EF28 is an external fanless HiFi-ATX power supply and can be used perfectly for the Mini chassis. The ATX-Adapter is mounted inside the case and the PSU is placed outside similar to laptop PSUs. The external and internal parts are connected with a high quality HiFi cable. The EF28 is capable of providing enough power for Intel's new Core 2 Duo as well as standard processors from Intel and AMD that do not demand more that 75W.

This PSU is only supplied with one 4-pin Molex connector and one 4-pin floppy drive connector. The recommended Slot Loaded DVD player for the Mini requires a floppy drive power connector and not a Molex. There is also a converter supplied that converts the 4-pin Molex connect to SATA, so it is possible to power both types of hard drives. If more than one hard drive is required then a Y-splitter is required (unfortunately Quiet PC do not stock this product).

PLEASE NOTE: This product is highly recommended if you intend to purchase the Mini case.


  1. For Mini chassis only
  2. Small DC/DC adapter with external PSU
  3. For 90V-264V
  4. Long lifetime and reliable
  5. High efficiency of 90% (DC-DC)
  6. Protection against over-current, over-voltage and over-heat

SpecificationsHFX 547
+3.3V maximum output current10 A
+5V maximum output current11 A
+12V1 maximum output current15 A
+5VSB maximum standby current4 A
-12V1 maximum output current0.1 A
Permanent power200W
Combined power289W
Dimensions internal DC-DC board (L,W,H) 120 x 60 x 22mm, 115g
Dimensions external AC-DC brick (L,W,H) 60 x 112 x 210mm, 1.3kg
Connection cable 1.50m
Certificates CE EN60950 / EMC EN55022 B,EN61000-3-2,3,5-3 Env50204
ATX12V (4-pin) supportYes
20-pin ATX connectorYes
24-pin ATX connectorNo
PCI-E support (6-pin)No
Number of floppy drive connectors1
Number of hard drive connectors1
SATA connectors1 (due to converter)
Warranty24 months

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