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Five 550 And 600 W 80 PLUS Platinum Power Supplies, Tested

Rosewill Fortress 550

The Rosewill Fortress 550 is listed for only $140, but is often available for less than $100, making it the least-expensive power supply in our round-up. As such, we can understand why it doesn't offer modular cabling. While all cables are sleeved and sufficiently long, there are only two PCIe connectors. Five Molex and six SATA connectors round out the cable package.

Like the Cooler Master and Kingwin supplies, Rosewill's has a single +12 V rail able to supply up to 45.5 A (exactly like the Kingwin unit). In fact, we cannot help but notice that the technical specs of Rosewill's Fortress 550 and Kingwin's Lazer Platinum 550 W are completely identical. The build quality of this power supply is likewise excellent.

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Rosewill Fortress 550
AC Input100-240 V, 50-60 Hz
DC Output+3.3 V+5 V+12 V (#1)+12 V (#2)+12 V (#3)+12 V (#4)-12 V+5 Vsb
20 A20 A45.5 An/an/an/a0.5 A2.5 A
Individual Output6 W12.5 W
Rail UtilizationSysSysCPU And VGA
Combined Output100 W546 W
Total Continuous Output550 W
Peak Output650 W

  • what? no overload it until it blows test?

    and i was making popcorn.
    Reply
  • mousseng
    Is that a typo in the first chart for Kingwin's Lazer? It claims that it fails 80 Plus's 50% load spec (82% of 92%); I assume that was meant to say 92% (since that's what the chart below it shows).

    Pleasant read, though, I like PSU reviews.
    Reply
  • What happen to Seasonic? They have the 520W fanless SS-520FL Platinum version. No PSU test is complete without a seasonic to compare to, in my own opinion.
    Reply
  • dudewitbow
    jupiter optimus maximusWhat happen to Seasonic? They have the 520W fanless SS-520FL Platinum version. No PSU test is complete without a seasonic to compare to, in my own opinion.they asked for vendors for the PSUs. Theres the offshoot chance that seasonic declined the offer. On other sites, the 520w fanless seasonic unit was compared to Rosewill's 500w silent night unit. The seasonic unit I believe in that review barely edged out a victory.
    Reply
  • cangelini
    iknowhowtofixitEither the Rosewill FORTRESS was defective or your calibration was off for the last test. Your o-scope shots do not match those of other highly credible reviewers. Also, I'm curious of your testing methodology, but it was not listed.I believe this is still applicable to all of the power supply testing our German team does: http://www.tomshardware.com/reviews/psu-test-equipment,2657.html. I'm waiting for confirmation that I'm right.

    Edit: Yup, that's the correct testing equipment/procedure!
    Reply
  • Dun dun dun..................... no acoustic performance measured, the only reason some people buy high end PSU's.
    Reply
  • sebbesapa
    WOW! Thanks a bunch for including the 25watt "Low-Power PC" efficiency test! All other reviewers stop @ 20% load witch is not "idle" or "low load" at all. :-)
    Reply
  • sanilmahambre
    Power supply unit is where a system builder cannot use a word "BUDGET"
    Reply
  • jaideep1337
    I don't understand
    Why is the 80 plus spec officially test by having more load on the 3.3v and 5v rails?
    Clearly loading the 12v rail would give us a better overall image
    Reply
  • jaquith
    Interesting, IMHO the most important aspect is 'Ripple Voltage' @ Rated Load. The only mention I see is a vague reference in your conclusion page.
    Never mind I see the ripple data buried in the individual tests. It would have been better in the summary side-by-side tests.

    Nice article.
    Reply