Gigabyte is the first to introduce a PCIe 5.0 PSU to the market, with the UD1000GM PG5, an updated version of the UD1000GM model featuring a 12VHPWR connector, able to deliver up to 600W. Besides this connector, there are other requirements in the ATX v3.0 spec which we couldn't verify in this PSU.
We conducted the new transient response tests, and although the PSU passed the 200% (100μs) and 120% (100ms) with success, it kept on shutting down with 180% and 160% transient loads, with 1ms and 10ms, respectively, transient load apply time. Since this is the first PCIe 5.0 PSU that we have evaluated, we will have to wait until more units become available to check how they will perform in the new transient tests, which are way more demanding than the ones that we have conducted far.
We pushed the PSU extra hard, but we didn't encounter any issues during testing. Given the problems with Gigabyte's PG-M line, we wanted to ensure that the UD1000GM PG5 wouldn't have any issues, so stressed even more than the typical, it didn't budge. There are several areas that Gigabyte could fix along with MEIC, the manufacturer of this product, and if they do, it will be more competitive. There are no other PCIe 5.0 compatible PSUs at the time of the review, but soon enough, there will be plenty of choices, and there is no need to rush your purchase since the new generation GPUs are not available yet.
Nvidia ships the RTX 3090Ti with 3x PCIe 6+2 pin to 12+4 pin adapters during this transition phase in PSU design. If you plan on purchasing one of Nvidia's upcoming, high-end 4000 series cards, you might want to avoid buying a non-ATX v3.0 compatible PSU right now, but if you don't need one, good choices in this category are the MSI MPG A1000G, the EVGA 1000 G6, and the Corsair RM1000x (2021).
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Disclaimer: Aris Mpitziopoulos is Tom's Hardware's PSU reviewer. He is also the Chief Testing Engineer of Cybenetics and developed the Cybenetics certification methodologies apart from his role on Tom's Hardware. Neither Tom's Hardware nor its parent company, Future PLC, are financially involved with Cybenetics. Aris does not perform the actual certifications for Cybenetics.