Voltage Regulation

+3.3V Regulation/Ripple and Noise
Load Voltage
5% 3.34V (9mV)
10% 3.33V (14mV)
20% 3.31V (17mV)
50% 3,31V (22mV)
80% 3.29V (24mV)
100% 3.27V (27mV)
110% 3.27V (30mV)
Crossload +12V max. -0.30%
Crossload +3.3V/+5V max. +1.52%


+5V Regulation/Ripple and Noise
Load Voltage
5% 5.10V (7mV)
10% 5.10V (11mV)
20% 5.10V (16mV)
50% 5.08V (19mV)
80% 5.02V (23mV)
100% 4.99V (27mV)
110% 4.97V (29mV)
Crossload +12V max. +1.00%
Crossload +3.3V/+5V max. -0.80%


+12V Regulation (Worst Ouput)/Ripple and Noise (Worst Output)
Load Voltage
5% 12.14V (20mV)
10% 12.10V (24mV)
20% 12.10V (29mV)
50% 12.08V (33mV)
80% 12.06V (37mV)
100% 12.00V (42mV)
110% 11.99V (44mV)
Crossload +12V max. -0.16%
Crossload +3.3V/+5V max. -0.42%

Noise Levels

Sound Pressure Level (Ambient: 16dBA, 1m distance) and Temperatures (Δϑ to 23.4 °C ambient temperature)
Load Opinion
5% 18 dBA (0.9°C)
10% 18 dBA (2.0 °C)
20% 18 dBA (5.1 °C)
50% 22 dBA (6.2 °C)
80% 27 dBA (8.6 °C)
100% 27 dBA (9.5 °C)
110% 27 dBA (11.2 °C)

Efficiency and PFC

Efficiency and Power Factor 115 VAC
Load Efficiency PFC
5% 71.25% 0.812
10% 84.97% 0.842
20% 91.03% 0.939
50% 91.64% 0.945
80% 91.22% 0.972
100% 90.79% 0.989
110% 90.38% 0.990


Efficiency and Power Factor 230 VAC
Load Efficiency PFC
5% 73.29% 0.735
10% 86.85% 0.829
20% 91.84% 0.877
50% 92.42% 0.925
80% 91.85% 0.956
100% 91.08% 0.972
110% 90.72% 0.983

Looking at the tables, all rails are within specification and acceptable for an expensive power supply. In fact, 12V didn't even drop below 12.00V at full load. However, ripple is much more important. Here the Fortress 450W can keep up with most other brands, even if Seasonic is still the best. Even at 10% load Rosewill delivers 85% to 87% efficiency. 115VAC reaches up to 91.64% efficiency, while 230VAC delivers slightly better results. From 0% to 50% load the Fortress remains silent, but once the load goes beyond this level the fan RPMs increase rapidly. The good news is that the bearing is absolutely inaudible and we didn't hear the chokes singing.

Internal Design Conclusion
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  • benji720 - Friday, September 14, 2012 - link

    Not to be a dick but there are so many grammatical errors and awkward or fragmented sentences in this article that it made it hard to read.

    "convert to an 6-pin connector"
    "According to that Rosewill stands up to Antec."
    "At best GlobeFan is slightly better than Yate Loon, but we don't want to overdo things." ??
    "All cables got the same black cable sleeving."

    These are just a few examples. Maybe I'm being nit-picky but one of the reasons I read this site is for well written, well thought out articles and I did not feel this article was either of those.
  • pattycake0147 - Friday, September 14, 2012 - link

    Seconded. I had to re-read the first sentence "Since we've had a ~40$ PSU roundup of late" I questioned if it should have read "we haven't had." Perhaps "Since we've had a ~$40 PSU roundup recently" would have made it more clear.
  • TrackSmart - Friday, September 14, 2012 - link

    We know from previous reviews/comments that English is a second language for the author. Most of us would be hard pressed to be write as fluently in a language outside of our native tongue.

    I appreciate the author's considerable knowledge of power supplies, including fans, bearings, and internal components - minor grammatical errors or awkwardness aside.
  • aliceyoung - Friday, September 14, 2012 - link

    I also get agitated when I read poor English, especially when sentences could be interpreted in two different ways depending on how I try to "fix" then in my head. But you know what? Screw it. It's a great review from someone who knows their stuff, and I'm paying for it with little more than my free time.
    Keep on writing articles like these, grammatically correct or not.
  • JarredWalton - Friday, September 14, 2012 - link

    Sorry -- Martin posted without going through one of the native-English speakers. I'm editing/proofing the article now, but it will be a couple hours before I can finish. Thanks for your patience!
  • extide - Friday, September 14, 2012 - link

    The Ripple Results link at the very end is wrong, it goes to the admin side, instead of the public side. It should be http://www.anandtech.com/show/5698
  • JarredWalton - Friday, September 14, 2012 - link

    Fixed, thanks! I didn't check all the URLs as I didn't expect any to link to our admin pages. :-)
  • The0ne - Friday, September 14, 2012 - link

    Agreed. This is quite bad.
  • JarredWalton - Friday, September 14, 2012 - link

    Still? I just finished editing, so if you find any major grammar/spelling issues remaining please let me know.
  • benji720 - Friday, September 14, 2012 - link

    No, it is much better! Thank you for your editing prowess, sir.

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