Rosewill Tokamak 1500 PSU Review

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Load Regulation, Hold-Up Time, And Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units. 

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The hold-up time we measured is lower than 17ms, and to our disappointment, the power-good signal is inaccurate. It drops when the rails are already out of spec.

Inrush Current

For details on our inrush current testing, please click here.

The inrush current results are a little higher than the competition in this category.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the Tokamak 1500's efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load in increments of 10 percentage points.

We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a PSU is Haswell-ready or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Swipe to scroll horizontally
Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan SpeedFan NoiseTemps (In/Out)PF/AC Volts
110.571A1.980A1.959A0.995A149.8391.90%850 RPM33.1 dB(A)36.30°C0.939
222.195A2.967A2.939A1.195A299.7793.85%850 RPM33.1 dB(A)37.31°C0.965
334.188A3.468A3.449A1.394A449.7793.99%890 RPM35.1 dB(A)37.87°C0.978
446.205A3.962A3.928A1.596A599.5893.65%1430 RPM46.3 dB(A)38.97°C0.984
557.923A4.966A4.915A1.801A749.6492.97%1785 RPM51.5 dB(A)39.44°C0.987
669.651A5.953A5.901A2.000A899.3991.80%2220 RPM56.1 dB(A)40.66°C0.990
781.419A6.955A6.888A2.202A1049.3691.20%2420 RPM58.2 dB(A)42.90°C0.992
893.245A7.951A7.878A2.407A1199.2790.59%2450 RPM58.6 dB(A)43.16°C0.993
9105.527A8.459A8.391A2.404A1349.3389.98%2450 RPM58.6 dB(A)43.82°C0.994
10117.603A8.961A8.881A3.021A1499.2889.19%2450 RPM58.6 dB(A)44.46°C0.994
11130.298A8.965A8.890A3.020A1649.3488.50%2450 RPM58.6 dB(A)44.81°C0.994
CL10.103A14.020A14.005A0.004A119.3082.99%2390 RPM57.5 dB(A)43.15°C0.935
CL2124.928A1.000A1.003A0.004A1506.5389.49%2450 RPM58.6 dB(A)44.46°C0.995

Load regulation is tight, especially on the minor rails. In addition, the Tokamak has no problem delivering more than its full power under high operating temperatures. The only issue we see so far is the fan's loud noise under loads in excess of 600W. The minimum fan speed could also be lower.

With 10% and 20% of its maximum-rated loads, this PSU easily meets the 80 PLUS Titanium requirements. However, in the middle range it falls 1% short of the specification's target. In addition, it's not able to hit 90% under a full load. As we're always forced to mention, the 80 PLUS organization doesn't test under real-world conditions inside of a case. It instead chooses to measure at 23°C +/-5°C ambient.

Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

  • Onus
    With GPU-based mining days long gone, I don't ever see myself in the market for a beast like this; but no power switch? That's...bizarre.
  • Brian_R170
    I keep reading that muti-GPU systems are on the decline, so what's continuing to drive development of PSUs with >1KW output?
  • leclod
    Same here...
  • kittle
    18972155 said:
    I keep reading that muti-GPU systems are on the decline, so what's continuing to drive development of PSUs with >1KW output?
    Im curious too -- i can only speculate the marketing folks are still pushing the "bigger number == better" mantra
  • JohnnyLucky
    There are still some hardcore enthusiasts and a few who want bragging rights. I couldn't help but notice quite a few cons.
  • captaincharisma
    there is always someone out there whether they are an enthusiast or a first time system builder that will blindly buy this because after all "bigger is better" lol
  • turkey3_scratch
    Rosewill always goes with a very simple exterior. I like it. This is also a very unique name. I'm sick of boring PSU names. Tomakamek. Sounds like some sort of ancient island, I like it.
  • SkyBill40
    The reactor of the same name was the first thing that came to mind upon seeing it and even before it was mentioned in the write up. An interesting choice, no doubt. Given the output, I guess it's somewhat fitting.
  • daglesj
    Must admit rarely use the power switch at the back. Quicker to know that a pulled power lead means 'off'...completely. No great loss.
  • lunyone
    So ready for this to be in a m-ITX build! Lol! Too bad it isn't modular! <sarcasm over>