HEC-350TW-TX Power Supply

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Very quiet power supply – Joe

SUMMARY: An OK unit for modest power applications.

PS

The good guys at the HEC Group were nice enough to send a sample of their HEC-350TW-TX Power Supply to try out, a 350 watt unit.

Key Features:

  • Connectors: One SATA HD, one Intel P4, six HD, two floppy and one 24 pin connector (you will need an adaptor for 20 pin connectors)
  • MTBF Above 100,000 Hours at 25ºC
  • Silent Technology – <32dB At 80% Load
  • EMI < 3dB
  • One 120 mm fan
  • Intel 1.3V compliant

Specs:

Spec

One thing I liked about this power supply is the 120 mm fan – quiet and moves a fair amount of cooling air:

Open

A closer look at the heatsinks shows an interesting design:

HS

Very simple yet quite effective.

Use Test

To try it out, I hooked it up to a P4 motherboard and recorded voltages and temps at idle and under stress (running Prime95):

Voltages

Rail

Idle Voltages

Stress Voltages

12 Volt

11.92-98

11.86-92

5 Volt

4.89

4.84-87

3.3 Volt

3.28-30

3.26-28

Temperatures

Under stress, I measured temps at the fan’s intake and at the exit of the power supply as follows:

Intake Temp

Exit Temp

Delta

21.3ºC

21.7ºC

0.4ºC

Fan noise was quite low and the temps were very reasonable – not a lot of heat coming from this unit. However, voltages did dip somewhat and all lines were a tad under their rated levels (using MBM).

CONCLUSIONS

Overall, the HEC-350TW-TX Power Supply appears to be a reasonable unit for modest power demand applications; the 120 mm fan is a plus for noise and cooling.

Thanks again to the HEC Group for sending this our way.

Email Joe

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