Features and Specifications

If you are looking for the biggest, baddest, power supply on the planet, then we have an exclusive review for you! But you better have a truck, a couple of strong friends, and very deep pockets.

Miller Electric has been manufacturing large, industrial-grade power supplies since 1929.  They are one of the few power supply manufactures who actually design and build their own products, right here in the USA.  Miller’s The Power of Blue series of high-capacity power supplies includes models that go all the way up to an astounding 10,500 watts!


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While we were not able to obtain a review sample of Miller’s flagship 10.5kW unit, we do have an exclusive review of the Miller XMT 300 PC, which can deliver up to 4,500 watts of pure DC power.   Talk about having some extra reserve capacity… wow!


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The Miller XMT 300 PC is an external power supply that is about twice the size of a typical mid-tower case and is designed to normally sit on the floor.  It features a unique single, high-capacity +12V rail capable of delivering up to 375A (4,500W).  A power distribution module mounts inside the PC where the normal ATX power supply would go and breaks down the incoming +12V to +3.3V, +5V, etc., along with providing a standard set of cables and connectors.  This allows one XMT 300 PC to power multiple PCs at the same time.


Miller XMT 300 PC Key Features:


  • Monstrous, single rail +12V output (up to 375A)
  • External main power unit sits on the floor
  • Can support multiple PCs at the same time
  • #6AWG copper cables for minimal voltage drop
  • Automatic fan speed control for optimal cooling and minimal noise
  • High efficiency operation (up to 87%)
  • Active Power Factor Correction  
  • 1-Phase or 3-Phase line voltage
  • 3-Year warranty 

Miller XMT 300 PC Specifications:


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Establishing an accurate load is critical to testing and evaluating a PC power supply.  PCPerspective’s power supply test bench can place a precise 2,000 watt DC load on the PSU under test.  Our current suite of tests includes:


  • Size and Weight
  • DC Load Regulation
  • DC Line Regulation
  • DC Cross-load (unbalanced load)
  • AC Ripple and Noise
  • Power Factor
  • Efficiency
  • Differential Temperature
  • Noise

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The Miller XMT 300 PC power supply was evaluated on both features and performance.  A full range of equipment was used to test the power supply under controlled load conditions.  I used everything I had to load down the big Miller PSU unit including all of the new electronic loads, two resistor load banks, and my original PSU load testers.


  • (2) CSI3710A Programmable DC load (+3.3V and +5V ouputs)
  • (4) CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)
  • (2) Custom-built, precision +12V loads (+12V5 and +12V6)
  • FLUKE 87-III True RMS digital multimeter (Accuracy ±0.05%)
  • Extech 380803 Power Analyzer (Accuracy ±0.5% of full scale)
  • Hitachi V-650F 60 MHz dual trace oscilloscope (Accuracy ±3%)
  • FLUKE  52-II digital thermometer (Accuracy ±0.3ºC/0.5ºF)
  • Extech Model 407736 digital sound level meter (Accuracy ±1.5 dB)



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