Zalman ZM600-HP Heatpipe Cooled PSU - ZM600-HP Testing and Conclusion

Article Index
Zalman ZM600-HP Heatpipe Cooled PSU
ZM600-HP - Closer Look
ZM600-HP - Specs, Rails and More
ZM600-HP Testing and Conclusion

Test System:

Our test system is listed below:


We ran three sets of voltage measurements on this power supply.  The first measurement was taken with the PSU plugged into the CaseBuy EZ PSU Tester 3.  The second measurement was taken with the system running idle at stock speeds.  The final measurement was taken with the system running fully loaded and overclocked.  Voltage and load measurements were taken with a multimeter - not with a software monitoring program.

The PSU load was 2W when empty and the PSU ran at 23C - only a couple of degrees warmer than room temperature.  When running at stock speed idle, the system drew a total of 180W and the PSU heated up to 36C.  When overclocked and running at full system load we only managed to draw 276W out of the PSU at a temperature of 37.5C.

With a overclocked Core 2 Duo CPU, overclocked 7950GX2 graphics card, and running a ton of applications including hard drive transfers, games and more we couldn't bring our system load up to half of what this PSU is rated.  Certainly it will be powerful enough for most systems.  That being said, how are the voltage levels?

Click for full-sized chart.
Click for full-sized chart

No matter what kind of a load we put on the PSU, we couldn't bring it over 300W in our test system.  This system is no slouch when overclocked either so the results kind of surprised me.  I thought we'd be able to draw more power and perhaps cause the rails to drop a little.  Apparently I was wrong.  The 12v rails are a little higher than 12v and never drop off more than 0.05v.  The 3.3v line fluctuates the most as it drops from 3.45v (no load) to 3.34v idle and remains rock solid when loaded.


The Zalman ZM600-HP has been rock solid throughout testing.  Since we installed it, it's been running our test system overclocked at 100% CPU load most of the time.  It has never wavered at all.  The voltage on the +12v rails is solid and is about .5 volts high - even when we are drawing as much power as we can.  If you have a high-performance system that you want to keep quiet, the ZM600-HP is a worthy choice.  If you have an extreme system that includes a couple of 8800GTX cards in SLI, and 8 or more drives running a Quad Core CPU, you may have to invest in a more powerful unit, but we can't even make this one sweat.  All-in-all, it's a top performer.


  • Modular design helps reduce cable clutter.
  • Active PFC is efficient.
  • Large, slow & quiet 120mm fan.
  • Heatpipe cooler in PSU!!
  • Blue LED inside adds bling!
  • Solid, stable power on four +12v rails.


  • None. Rating
Software Pack:
Total Score 9.8


I'd like to thank ZalmanUSA for sending this PSU over for us to review.

If you have any comments or questions, please feel free to drop us a line in the forum at the "Comments" link below.