Package and Appearance

The package is very large and fortunately there is a handle in the top of it. Opening the box reveals two smaller boxes inside, the first of which contains the power supply and the second the extra cables, screws, and accessories. The two packages differ from their color on the bottom of the front-side.

The power supply is very long as we stated already. This comes from the extra heatsinks, which are connected to the real heatsinks on the PCB through heatpipes. There is a 140mm fan mounted on the bottom of the power supply to move air through the case. The units have been coated with a mirror-like dark color which makes it easy to leave finger prints and scratches. The whole back is perforated for maximum exhaust, and you can see the extra heatsinks behind the small holes.

Next to the main harness coming out of the power supply there's a small switch labeled "standby noise suppressor". This switch is supposed to help reduce the noise while the PSU is switched off in standby mode. We tested this function and didn't really find a need for it. If the switch is in the ON position the noise is higher than in OFF mode. Even more important is that if the switch is switch on the power consumption of the unit goes up to 4W instead of the 1.9W while the switch is off. Our conclusion if you own this power supply: leave the switch off.

Index Cables and Connectors


View All Comments

  • jamesu79 - Friday, June 12, 2009 - link

    I would like to bring the spotlight to various issues regarding this product and some of it's siblings (zm850-hp for instance). It suffers from a quite extreme variant of coil whining / squealing. Some sort of electrical high pitch noise that just drives you insane. I found a good video of it here:">

    This seems to happen with a lot of the newer graphics cards, especially Geforce 260/280/285/295 and Radeon 4850/4870X2 etc etc. It also produces the same noise when you scroll a web page or copy a file to your hard drive. In fact, any hard drive activity triggers the same sound, albeit at a lower intensity, but still very audible.

    When I first got this power supply and noticed this I tried to get in contact with Zalmans support. They kept telling me that they had forwarded my messages to their supervisors who, during a period of 4 months, haven't e-mailed me back. Not even once. Even though i sent follow-up e-mails twice a week. Or they would tell me to send e-mails to this other set of addresses (support1,2,, which never replied either. I did this 2 times a week for 4 months.
    In other words, I was being completely ignored by their so called "support". They have been indefinitely postponing any type of resolution for this problem.

    The issue gets worse when you realize that even if you RMA this product, since its a manufacturing fault; you would just end up with the exact same problem.

    My honest recommendation to anyone thinking about buying this power supply would be to stay away. Or do very, very thorough research on if the rest of your PC components are compatible with this PSU in such a way that it doesn't generate squealing.

  • gwolfman - Thursday, July 03, 2008 - link

    So if this is supposed to aid in cooling, where are the temp measurements? I'm quite disappointing not seeing any. I feel cheated since that's what's so unique about this power supply and you don't even test it. Boooo! Reply
  • BlandooV - Monday, June 30, 2008 - link

    What exactly does SLI and Crossfire guarantee you with a PSU? Also, I'm with MadAd...where do the heatpipes take the heat to that makes it more efficient than heatsinks alone? Reply
  • MadAd - Monday, June 30, 2008 - link

    Why? Just why?

    Heatpipes only move the heat from one place to another, its still got to be dumped out of the system some how.
  • schouwla - Saturday, June 28, 2008 - link

    In Japan the cheapest price is ¥29,498 for ZM850-HP Reply
  • Merman - Saturday, June 28, 2008 - link

    To quote your comment reply from the last PSU review:

    [quote]I find Ripple/Noise also very important but since nobody said a word I thought I could leave the graphics out and just add a comment. I always needed quite some time for the ripple graphs. I will add at least the comments again in the future and new models I get will have the ripple graphs again... alright? It's just there are not many people actually understanding what this topic is about and we need to still keep it accessible. No worries, I am working 7 years with power supplies and had several product managing positions in several companies. I know it's an important topic :)

    If you are not leaving out important information maybe its the editor??? The power supply reviews on this site have degraded to the point of not worth reading. :(
  • Kanchenjunga - Saturday, June 28, 2008 - link

    "It seems to be the same as the Antec Quattro which we tested last year. We recommended at that time to go for the smaller version with 850W because the 1000W unit didn't really bring many advantages with it. We will see later on in the tests if things are the same with these two units today. Even though we have 10 to 15 amps more on the 3.3V and 5V rails, the combined power of the 1000W unit is not too far away from the combined power of the 850W version. With the six 12V rails the same, there we have just roughly 200W more with the 1000W unit."

    Say what? It's not the same as the Antec Quatro which has only 72W of 12V power difference between the 850W and 1000W versions. And why do say the six 12V rails are the same when the label clearly says there is 240W difference?

    Also which of these two models in the review did you test for the DC output graphs and which of the six 12V rails does your 12V rail graph show and why are your reviews increasingly useless?

  • anonymous x - Friday, June 27, 2008 - link

    couldn't they make this giant thin smaller? My antec earthwatts 500 PSU, while delivering much less power, can actually fit in a micro-atx case without rubbing into my dvd drive. Reply
  • bob4432 - Friday, June 27, 2008 - link

    not the one about the tps reports, the one about the fact that ~85% of the people using computers don't need more than a 400W quality unit? WTF is up w/ these 1KW units? hell, even 650W or higher?

    i have a decent rig - e2160 @ 3GHz (swapping out to a e8400 soon as i need a bit more cpu for some 3d modeling appes), 3GB ddr2-667, 15k u320, 7.2k 7200.10, 3850 512MB gpu, gigabyte p35-ds3l, 3x80mm fans, a 92mm cpu fan and a few pci cards, and at idle this system pulls an amazing 95W, at full load using 2 instances of prime95 and gaming it maxes out at 185-190W according to my kill-a-watt. i am running it on a ~$10 antec EA 380 unit that works perfectly. if i had another pci-e plug i am sure i could run cf fine if i wanted to.

    my point - these 1KW units are kind of a joke for the majority of us but yet you reviewers just love them. why not review what the people need and actually make a review that will help people, the vast majority of people?
  • gwolfman - Thursday, July 03, 2008 - link

    You forgot to do you TPS reports? Did you get the memo? I'll be sure to get you another one. :) Reply

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