Seasonic X900 - 900W


What a beauty Seasonic has here! Unfortunately, it's not even available in the United States. As we stated before, the US market doesn't need to be too sad since we will see the same power supply under a different name. Still, it's funny to see a little sticker showing 200-240VAC on the back suggesting this power supply should only be used in Europe. We have tested this unit on 90VAC and 120VAC without problems, so you can ignore the misleading sticker. Of course, Seasonic probably has reasons for these actions.


Four times 18A for the 12V rails is good. With a combined power of 72A, the 12V rails can almost reach the rated 900W on their own.

Cables and Connectors


This power supply also has the cables sleeved with black mesh. The cables are quite short, which is surprising for a high-end unit that will likely be used in a bigger case. Apparently, Seasonic feels differently, and they have attached many harnesses with lengths of 25cm to 65cm. The amount of connectors is good and the lengths will work well in smaller cases; then again, smaller cases probably don't need this many connectors.


Opening the unit, we find a unique and sleek design which is made for cooling by a single 80mm fan. The heatsinks are T-shaped and only allow for horizontal airflow. Comparing this unit to the nice 750W red one from before, there are several added components that help it reach the higher performance rating. Again, we see a high-quality Nippon Chemi-Con cap in the primary. The temperature of the heatsinks is been also very good, but this is due largely to a very annoying fan.

OCZ ModXStream 780W Silverstone OP850
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  • Christoph Katzer - Friday, November 23, 2007 - link

    The arrangement will be changed next time ;)
    What about the amount of PSUs? Too many?
  • strikeback03 - Tuesday, November 27, 2007 - link

    I like the voltage vs. load charts used previously better than the bar charts. Obviously impractical with a 10 PSU roundup, but I hope they come back for smaller articles.

    Would it at least be possible to keep a consistent order to the PSUs, instead of sorting by output voltage? On the 3.3V charts on page 4 for example, it's confusing to have the Hiper 730 at the bottom of the 20% chart then the top of the 50% chart.
  • Dayneaw - Thursday, November 22, 2007 - link

    The first graph on page six seems to be missing the results of the silverstone.
  • rickon66 - Thursday, November 22, 2007 - link

    I love it when folks complain without even reading the review.
    "Maybe you just forgot to upload the final page?"
    Maybe you just forgot to read the review!!

    Anyway-Good job on the review.
  • Talcite - Thursday, November 22, 2007 - link

    Good job guys, the o-scope readings/explanations are particularly nice =D.
  • SOLIDNecro - Thursday, November 22, 2007 - link

    No "Final thoughts" or "Conclusions"???

    A summary report is one of the most important, if not most important part of any article, to leave it completely up to the reader to draw conclusions based on charts requires to much time and expertise for your average reader!

    Also your "Editors" choice awards are invaluable, you guys are the "Pro's" and should be able to guide the reader to what you would purchase for your own rig, and why it stood out from the rest of the pack

    Maybe you just forgot to upload the final page?

  • JEDIYoda - Thursday, November 22, 2007 - link

    So whats so hard about making your own conclusion and thinking a little bit?

    Editor`s awards are bogus!

    Grow up dude!
  • JEDIYoda - Thursday, November 22, 2007 - link

    Editor choice rewards awards are bogus!
    You can read and comprehend - can`t you?

    Make up your own mind!
  • Christoph Katzer - Thursday, November 22, 2007 - link

    Just check the new arrangement. I wrote the comparison first and if somebody is interested to know more about a product he/she can check details after. The conclusion is on page 8.
  • ChronoReverse - Thursday, November 22, 2007 - link

    I find it rather confusing that way. I also thought that there was no conclusion until I read the comments.

    That said, I do usually read the conclusion first. Perhaps it should go back to the end and then a short abstract placed in the front?

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