Dual PSU

The power supply has two input connectors: one for the 277V AC input and another that accepts 48V DC. The PSU can operate on 48V for about 10 minutes before getting too hot and shutting down, so the power supply is not built to run on 48V DC all the time. The idea is that 48V DC circuits replace a traditional UPS system; after a few minutes the generators should be online and the power supply should be back on the 277V AC input.

The power supply is extremely efficient: up to 94.5%.

Using 277V compared to 208V allowed Facebook to save about 3-4% of energy use, a result of lower power losses in the transmission lines.

The Facebook Open Compute Servers Power Supply Efficiency Visualized


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  • fpsvash - Thursday, November 03, 2011 - link

    In the middle of the paragraph below the image caption, the sentence reads "...and offers better slightly better performance..."

    Other than that, nice post!
  • ahmetmy330 - Thursday, December 29, 2016 - link

    this is my university work about open servers. Thanks for post
  • InternetGeek - Thursday, November 03, 2011 - link

    It's interesting that no many players have taken a look at Open Compute. Reply
  • alent1234 - Thursday, November 03, 2011 - link

    it's a solution for a specific workload. there are still a lot of workloads that require the traditional model of big database servers

    unlike your bank, facebook's noSQL is not ACID
  • FunBunny2 - Saturday, November 05, 2011 - link

    Well, yes a voice of reason. OTOH, the Facebook et al folks are convinced that their back to the COBOL era is the future. As if a toy application, albeit pervasive, is "innovation". Reply
  • Sivar - Saturday, November 05, 2011 - link

    It's a little difficult to look at a comment about Facebook being a toy application and take it seriously. Yes, Facebook is not directly processing bank transactions on a Tandem, but their site is used to conduct business -- and is even the basis for many businesses, all over the world.

    Zynga, the company that makes a few annoying games for Facebook, is worth $15 -- more than Electronic Arts.

    Nearly every major online publisher, including Anandtech, uses their API for content distribution and often as the entire forum system for discussion of publications.

    The founder is the youngest billionaire in history.

    Calling theirs a toy application sounds like a Blockbuster customer calling Redbox a toy. It's denial of an obviously successful, large, powerful, innovative company because they don't do things "the old way."

    I suspect what matters more is that the business is executing flawlessly, the actual problems with data loss or other non-ACID compliant traditional issues are minimal, and that they are making enough money that Google and Microsoft are feel seriously threatened.

    One last thing -- if you really look into what ACID compliance means (and I know you did not specifically mention the acronymn, but replied to someone that did) none of the current major DBMS's are truly ACID compliant. It's too slow. Not Oracle. Not MSSQL. Not Greenplum. Not Teradata. None of them. They may be closer than NoSQL or the like, but then it's all about the right tool for the job, right?
  • Ceencee - Wednesday, November 09, 2011 - link

    This is true but ACID can be over-rated for many workloads. How many pieces of data HAVE to be consistent across the entire cluster to be valid? What about NoSQL with configurable consistency like Cassandra?

    NoSQL databases provide the holy grail of system growth which is horizontal scaling and this is no small thing for anyone who has worked with a very large RDBMS like ORACLE and implemented RAC to find it doesn't scale all that linearly for most workloads.
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  • ahmetmy330 - Thursday, January 12, 2017 - link

    I have told you
  • ac2 - Thursday, November 03, 2011 - link

    Wouldn't the presence of the graphics on the HP server account for the 32W idle load savings? Reply

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