Hot Test Results (~45°C Ambient)

Despite its lengthy warranty, the components of the UD1000GM PG5 left us unimpressed and our testing verified our initial assumptions. The PSU suffers when it has to operate inside a very hot environment, with the efficiency taking a brutal drop at high loads. The average efficiency reduction of 1% across the nominal load range does not seem that high but the efficiency drop is very high when the load is greater than 800 Watts, suggesting severe thermal stress.

Despite the very high ambient temperature, the fan of the GIGABYTE UD1000GM PG5 failed to start right away with the unit operating inside our hotbox. This resulted to worryingly high temperature readings at low loads. Once the fan started, the temperature dropped significantly, rising little by little as the load increased. The temperature does reach high figures again once the unit is heavily loaded but always stays within operating levels.

Even though it does not start right away, as expected, the 120 mm fan is giving its all to keep the GIGABYTE UD1000GM PG5 cool enough under these adverse operating conditions. The very moment is starts, the fan will be audible to the user, rapidly increasing in speed as the load increases. It reaches its maximum speed when the load is just a little higher than 50% of the unit’s capacity, valiantly trying to keep the PSU reliable and operational. The noise figures are above 50 dB(A), a figure that will annoy even the most tolerant of people if they are not wearing headphones – or ear protection.

Cold Test Results (~24°C Ambient) Power Supply Quality & Conclusion
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  • DanNeely - Monday, June 27, 2022 - link

    Aren't GAN power transistors significantly more expensive though?
  • meacupla - Tuesday, June 28, 2022 - link

    What you are looking for already exists.
    There are several GaN SFX PSUs, as well as GaN SFX PSUs that are on the market and available for purchase.
    Great Wall is one of the OEMs that offers GaN PSUs, while Corsair, Cooler Master, and Silverstone all offer a GaN PSU of some sort. Not sure if there are others.
  • Shmee - Friday, June 24, 2022 - link

    I wonder how explosive these are.
  • DigitalFreak - Friday, June 24, 2022 - link

  • 3ogdy - Saturday, July 16, 2022 - link

    Remember Gamers Nexus' experience:they bought a lot of Gigabyte PSUs and most of them ended up blowing up. Based on that, I wouldn't touch a Gigabyte PSU with a 10 ft pole.
  • mode_13h - Sunday, July 17, 2022 - link

    Were they all the same model? Did they diagnose the cause? Because my two thoughts would be that either it's a batch failure from the assembly line or a batch failure of a common component.

    Either way, it suggests poor quality control on Gigabyte's part, but hopefully they'll learn from that experience.

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