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Reviewed by: Carl Nelson [10.10.02]
Parts by: Thermaltake, Zalman, Seagate

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UPDATE - Since this article was written 3 years ago, a lot of the information found within is somewhat dated. For information on the latest in Silent PC Hardware, please visit our affiliate site, How To Build a Silent PC.


Thermaltake Silent PurePower TT-A420APD

The Power Supply is actually serving 2 purposes in our dead silent PC.  First of all it is of course going to be our PSU unit, but it is also the only thing with fans in the entire PC.  That's right, when I say silent I mean it.  Since it is serving this purpose as well, we are going for Tt's dual fan solution (they also offer single fan PSUs which should be even quieter).

We are counting on Thermaltake to offer a VERY quiet PSU, because it will be the only thing making noise.  Luckily for us, Tt delivers.

Thermaltake's 420APD employs a variable fan speed (on both the intake and output fans) based on temperature.  The minimum speed for the fans is just 1300 RPM, but they will never go above 2400 RPM.  In our case, the speed never went over 2000 RPM, as you'll see later on.

Now that we've established that the 420APD is extremely quiet (with test results to prove it below), we can go on about the PSU itself just a bit, because it's really a great unit.  The 420APD carries an MSRP of just $60, which is about half of what similar PSU's from Vantec and Enermax go for.  It's every bit as robust as those PSU's, with extremely long cables, and more Molex plugs than you will probably ever use.

It offers active Power Factor Correction, for the most efficient load handling possible.  Also worth noting is the fact that it is a very heavy unit.  The moment I picked this thing up, I knew it was a quality piece.


To test the noise created by the PSU (and thus, the only noise being created by the entire rig), we used a decibel meter, placed directly above the it under full load.  We took care not to place the microphone in front of the fan - we want to measure noise created by the fans, not by the wind blowing on the dB meter!

We tested it against single-fan PSU by god-knows-who, some cheap ass Chinese brand ($20-30).

There you have it, this is ALL the noise our Dead Silent Rig is creating - barely a whisper to my ears.  Quite a difference between this silent power supply and the cheap one I know so many of you are using ;)

Now that everything in our entire rig is silent, we need a new HDD!

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