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    SSD adapters- power consumption

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by vinuneuro, Feb 15, 2012.

  1. vinuneuro

    vinuneuro Notebook Virtuoso

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    vinuneuro, Feb 15, 2012
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  2. castel8

    castel8 Notebook Enthusiast

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    It would not affect the power consumption at all. It's an adapter with no active circuitry, just like an EU to USA mains plug adapter.
     
    castel8, Feb 15, 2012
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  3. vinuneuro

    vinuneuro Notebook Virtuoso

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    Yes, but it will add resistance. When ssd idle power consumption is around 0.5W, it's bound to make some difference.
     
    vinuneuro, Feb 15, 2012
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  4. ivan_cro

    ivan_cro Notebook Consultant

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    yes, but it is negligible, same as longer vs shorter power cable in a desktop, no difference whatsoever.
     
    ivan_cro, Feb 15, 2012
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  5. castel8

    castel8 Notebook Enthusiast

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    The SSD won't have a voltage regulator onboard so there will be no additional power draw. It just means your SSD will operate at a slightly lower voltage.

    If we take your power consumption figure of 0.5W, a nominal operating voltage of 5v and an additional 1 ohm resistance over the adapter circuit, the SSD can be represented as a 50 ohm load (0.5W = 0.1A at 5V, 5 / 0.1 = 50 ohms).

    Since we've added an additional 1 ohm at the voltage source the SSD will not receive 5v but 4.9v (50 / 51 * 5). This within the +-5% tolerance of the ATX specification ( http://www.formfactors.org/developer\specs\atx2_2.pdf page 22 section 4.1.4).

    tl;dr using an adapter like this will not affect power consumption at all.
     
    castel8, Feb 15, 2012
    #5