We had a lot of troubles with Vantec’s last power supply, the Stealth.  We found an error in the production label, which quickly led to a change in all the labeling on all Stealth power supplies.  If anything, we were glad we could make a difference to change a product before it was too late.  Vantec took a lot of our comments to heart, and thus put out a second revision on the Stealth.

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We were told that some of the changes in the power supply included tighter manufacturing specifications and an overall better performing final product.  Vantec also took the liberty of lowering the price of the unit a bit to avoid discouraging system builders.  With those new elements in mind, we set out to try one more time. 









combined theoretical

actual combined

advertised  total

Vantec Stealth 520W










Notice that the combined rail on the 520W Stealth is 260 watts.  Interestingly enough, +5.0V rail comes in at 260W.  This is unusually high, and as a result the +3.3V rail is unusually low.  We definitely would not recommend this power supply for AMD system builders, especially overclockers. (Intel system builders will have no problems with wattages).

The saving grace for Vantec comes in the features.  Later in this article we will explain why we are not crazy about the fan control switches, but the cable management, serial ATA connectors, and universal ATX adaptor are great additions. The 24 pin ATX cable will only show full usefulness on Intel server motherboards, but the 24pin to 20pin adaptor is included for standard desktop motherboards as well. The Stealth also comes with 9 standard molexes, which makes sense if this power supply is to target server markets.

By far, the best feature is the external AC plug.  Perhaps it is sort of a nostalgic addition for power supplies, but it definitely is an option that makes sense.  For example, plugging your speakers into the Stealth assures that they are off when your computer is off.  Thus, the speakers do not crackle or produce feedback when shutting down. We don't really recommend connecting a monitor to this outlet, particularly CRTs. You can really damage a CRT by pulling the power on it, so if your computer shuts down unexpectedly a lot, you will have a tough time keeping your CRT in good health.

The Stealth is not a cheap power supply.   Our 520W version costs about $120, which limits their ability to reach out to system builders with shallow pockets. Most of this cost is attributed to the aluminum construction, but other things such as the fan control also kick the price up.

ThermalTake PurePower 480W Vantec Ion 400W
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  • Anonymous User - Tuesday, August 5, 2003 - link

    I personally thought the Antec True Power 330 was shining a little bit in this review. With 31.0 - 34.5 dBa noise, 26.5 - 33.8 C temp, on the lower end of memory errors, and a little tighter voltages than the average, it seems like it gives you the best combination of all categories. The only thing we're missing is some of the wattage testing. What do you guys think? And what about some of the other True Power product line - perhaps the 430 since 330 is at the lower end of PSU size that I would like to get for the power usage of any new computer (the True Control 550 is in a different product line than the True Power).
  • Anonymous User - Tuesday, August 5, 2003 - link

    Seasonic Super Silencer 400 would be interesting to test later - see if their claims of efficient, cool and quiet are accurate.
  • abr27440 - Tuesday, August 5, 2003 - link

    does it strike anyone else as odd that their memory if flopping bits left and right on their test? Dont know about you but i would prefer NO bit flips. :)
  • Anonymous User - Tuesday, August 5, 2003 - link

    A few clicks of my calculator indicate that only the Zalman ZM400A-APS and Fortron FSP400-60PFN did significantly better than average on the Interference Test, and only the TTGI/Superflower 420SS and TTGI/Superflower 520SS 4Fan did significantly worse.

    What were the results when different memory modules were tried, preferrably other makes of modules with other makes of chips? I'd like to know because the error rates indicated are roughly 10,000 to 1,000,000 times what memory manufacturers claim in actual systems.
  • Anonymous User - Monday, August 4, 2003 - link

    I'm a bit confused over what it takes to be a good power supply? You slammed the Antec TruePower 330 for its "modest" +12 volt rail (204 watts). Yet you give the Frotron FSP400 your editors award and it only pumps 180 watts on the +12 volt rail. I would think this is a very important part of the formula for your pick since so many systems by your readers have high demands on the +12 volt rail due to the popularity of high end video cards. Comments?
  • Anonymous User - Monday, August 4, 2003 - link

    Another agreement with #15 and #18. If you want quiet, go for the silencer series. They are the same PS with different cooling.

    I discovered this when I found out what an outstanding company they are. My first PCP&C supply was a silencer 235, which is still running perfectly after 8 years. However, it wasn't enough juice for a P4 system. I wanted a new silencer with more power, but I balked at the price of the 400. I bought the turbocool 350 and boy was it loud! I called PCP&C and told them of my dilemna: what I really wanted was a silencer 350, which they didn't offer. NO PROBLEM! They put together a custom, full-warranty 350 silencer for me for $10 extra and shipped it right out.
  • Anonymous User - Monday, August 4, 2003 - link

    The page on the TruePower 330 says the power on the +12V rail is 'extremely modest'. Did you mean to say the "+5V rail", rather than the "+12V rail"?
  • KF - Monday, August 4, 2003 - link

    The startling part of this review is that every power supply produced memory errors within six hours. It would seem every PC is unrealible and therefore worthless, regardless of the power supply. The cause could just as easily have been junk (noise, spikes, drop-outs, oscillations) on the power supply leads as electromagnetic interference. Or maybe it was a problem with the motherboard.

    Another interesting fact is that all the power supplies preformed insignificantly different under the loads used. Good news for people using cheap power supplies.

    It would be interesting to know what the loads on the different voltage supplies are for real PCs by actual measurement. Not guess, not calculation from the labels. Monitor the currents while you do some of those stressful mobo benchmarks. How much on 12V, 5V, 3.3V? Without numbers, it is impossible to gauge what realistic power supply specs should be.
  • Anonymous User - Monday, August 4, 2003 - link

    Erm, don't know of any mobo using the +3.3 as source rail for an AMD cpu; perhaps you might look at the +5.0 as a candidate.

    What 'theory' is behind that "theoretical combined" value? Meaningless, except to show a lack of understanding of how a 'standard' PSU is constructed (the only PSU where this would be comprehensible are the non-standard design Truepowers, where, of course, the value was ommitted).

    A multimeter (or mobo sensor) gives only vague 'averages' of the madly fluctuating voltages that occur as millions of transistors switch on and off on each clock cycle; these broad values are only useful as an indicator of capacity/quality by the amount of sag between idle and load. You need a trapping 'scope' to nail the maximum variations to see the quality of the regulation (also to actually measure ripple).

    Generally speaking, about 20W are consumed by the control (-) voltages, so that the total actual capacity of the three power rails is less than the claimed power. I have never seen a manufacturer claim a wattage not rounded to 5W, and just as the individual +3.3 and +5 wattages can 'sum' to a value greater than the TCO, so can the TCO and +12 wattages 'sum' to a number greater than the combined +3.3 +5 and +12 total wattage capacity. All of this leads to the impression that some table values (+12 in particular) were 'calculated' under some 'theory', and not the manufacturers' specs.

  • Anonymous User - Monday, August 4, 2003 - link


    IF you mods want to play the PC card, they play it fairly or don't play it at all.

    Why is a thread locked, when a person mentions a "blackie is aggressive, or these "africa americans are always aggressive".

    Yet when another individual makes a similar thread, but this time ranting on "hispanics are all crazy etc etc" it doesn't get locked on.

    Or this one is my favorite, i just saw a thread where someone mentioned his "retarded neighbour" lit fire to a paper roll or something. Now i thought calling someone retarded is not Political correct.

    Like i said if you mods want to play the Political correctness game, then play it fairly or stop choosing at your will which threads offend you personally.

    I assume this message won't get thru, because its sent from an anonymous. oh well.

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