AMD AM1 Retested on 60 Watt Power Supply

Subject: Editorial | April 23, 2014 - 06:51 PM |
Tagged: TDP, Athlon 5350, Asus AM1I-A, amd, AM1

If I had one regret about my AM1 review that posted a few weeks ago, it was that I used a pretty hefty (relatively speaking) 500 watt power supply for a part that is listed at a 25 watt TDP.  Power supplies really do not hit their efficiency numbers until they are at least under 50% load.  Even the most efficient 500 watt power supply is going to inflate the consumption numbers of these diminutive parts that we are currently testing.

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Keep it simple... keep it efficient.

Ryan had sent along a 60 watt notebook power supply with an ATX cable adapter at around the same time as I started testing on the AMD Athlon 5350 and Asus AM1I-A.  I was somewhat roped into running that previously mentioned 500 watt power supply due to comparative reasons.  I was using a 100 watt TDP A10-6790 APU with a pretty loaded Gigabyte A88X based ITX motherboard.  That combination would have likely fried the 60 watt (12v x 5A) notebook power supply under load.

Now that I had a little extra time on my hands, I was able to finally get around to seeing exactly how efficient this little number could get.  I swapped the old WD Green 1 TB drive for a new Samsung 840 EVO 500 GB SSD.  I removed the BD-ROM drive completely from the equation as well.  Neither of those parts uses a lot of wattage, but I am pushing this combination to go as low as I possibly can.

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The results are pretty interesting.  At idle we see the 60 watt supply (sans spinning drive and BD-ROM) hitting 12 watts as measured from the wall.  The 500 watt power supply and those extra pieces added another 11 watts of draw.  At load we see a somewhat similar numbers, but not nearly as dramatic as at idle.  The 60 watt system is drawing 29 watts while the 500 watt system is at 37 watts.

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So how do you get from a 60 watt notebook power adapter to ATX standard? This is the brains behind the operation.

The numbers for both power supplies are both good, but we do see that we get a nice jump in efficiency from using the smaller unit and a SSD instead of a spinning drive.  Either way, the Athlon 5350 and AMD AM1 infrastructure sip power as compared to most desktop processors.

Source: AMD