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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The GIGABYTE GAMING 1000GM PG5 (product code GP-GME1000GM PG5) is a strong choice for a high-end GPU build if you want high measured efficiency, a GPU protection feature, and quiet operation at everyday loads. It is a weaker fit if you run the system hot at full load for long periods, because its fan becomes loud in that scenario, and its other electrical measurements are only average for its class.
Which model this is
Gigabyte sells several 1000W power supplies, so the exact model matters. The product covered here is the GIGABYTE GAMING 1000GM PG5, product code GP-GME1000GM PG5. Gigabyte also sells the older UD1000GM PG5, which is a different product. Check the model name and product code on the label or the retail listing before you buy, because similarly named units can look almost identical in listings.
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Key specifications
Gigabyte describes the unit as a 1000W, fully modular ATX 3.1 power supply. Its official product page and Tom’s Hardware’s review, published 27 September 2026, both report the following features:
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- Standards: ATX 3.1 and PCIe 5.1 compliance, with a native 12V-2×6 connector.
- Rails and modularity: a single +12V rail and fully modular cabling.
- Fan: a 135mm smart fluid dynamic bearing (FDB) fan with HybridCool fan control.
- Components: Japanese capacitors.
- Certification listings: 80 PLUS Gold branding, Cybenetics ETA Platinum, and a LAMBDA A- rating, all listed on Gigabyte’s product page.
- Protections: T-Guard Active GPU Protection, plus several general protections that Gigabyte lists without detail.
- Manufacturing: Tom’s Hardware reports that HEC manufactured the unit.
- Warranty: Gigabyte’s page states a ten-year warranty, which is subject to region. Confirm the terms that apply where you buy.
The Gold badge and the Platinum results
Gigabyte’s product page leads with 80 PLUS Gold branding, yet it also lists Cybenetics ETA Platinum. Tom’s Hardware reports that the reviewed unit held Platinum certifications from both CLEAResult, which administers 80 PLUS, and from Cybenetics. In other words, the badge printed on the product understates the certification level the review found.
#1 Best Overall
- 1000W Capactiy with Single +12V Rail
- Supports PCIe Gen 5.0 graphics cards (12+4 Pin) & Intel ATX 3.0 Certified
- 80 Plus Gold Certified
- ATX Form Factor
- Fully Modular Design
That gap is worth knowing about when you compare power supplies. When a badge and a certification listing disagree, look up the unit’s certification entries with the certifier rather than relying on the badge alone. For this model, the review’s measured results are the more informative figures.
Efficiency measurements
Tom’s Hardware measured the efficiency of its sample across its nominal load range and at sustained 1000W. These are results from one reviewer testing one unit, not market-wide figures.
| Measurement (Tom’s Hardware, 2026) | 230 VAC | 115 VAC |
|---|---|---|
| Average efficiency across the nominal load range | 92.6% | 90.6% |
| Efficiency at sustained 1000W | 91.0% | 88.5% |
The 230 VAC figures are the relevant ones for most European and many other international mains supplies, while the 115 VAC figures apply to North American 115V outlets. Efficiency is always tied to the input voltage, so a 230 VAC result cannot be read as the number you will see on a 115V wall outlet.
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Rank #2
- 1000W Capactiy with Single +12V Rail
- Supports PCIe Gen 5.1 graphics cards (16 Pin)
- Intel ATX 3.1 Certified
- 80 PLUS Gold Certified
- ATX Form Factor
T-Guard and the 12V-2×6 connector
What T-Guard does
Gigabyte says T-Guard monitors the 12V-2×6 cable for abnormal heat buildup. If it detects a risk, it cuts power to the GPU. The protection is aimed at connector overheating, which is the failure mode that has drawn the most attention for high-power graphics cards.
The description comes from Gigabyte. Tom’s Hardware’s coverage repeats the mechanism and frames the unit around T-Guard thermal protection, but the sources available for this review do not provide independent test data on how T-Guard responds under every fault condition. Treat it as a useful safeguard, not a guarantee against connector problems.
Keeping the GPU powered after a trip
According to Gigabyte, the system can stay active after a T-Guard trip only when the processor has integrated graphics and a display is connected to the motherboard. Otherwise, a reboot is needed to restore power to the GPU. If you run a discrete GPU with no integrated graphics fallback, expect a reboot as the recovery step after a trip.
Rank #3
- 1000W Capactiy with Single +12V Rail
- Supports PCIe Gen 5.1 graphics cards (16 Pin)
- Intel ATX 3.1 Certified
- 80 PLUS Gold Certified
- ATX Form Factor
Connector cue
The product page describes a dual-colour 12V-2×6 connector as a visual aid for seating the plug. In Gigabyte’s words: “The dual-tone connector gives a clear visual cue to confirm a secure connection.” This helps you spot a plug that has not fully seated, but it does not replace checking the connection yourself.
Noise and fan behaviour
The fan behaviour is where this power supply splits into two very different experiences, depending on load and room temperature. Tom’s Hardware reports the following at room temperature:
- The fan stays stopped up to roughly 30% load, about 300W.
- The fan is barely audible up to 500W.
- The reviewer describes the balance between temperature and noise as good under ordinary conditions.
Under sustained heavy load in a hot environment, the fan became very loud and approached top speed at full load. Hot, full-load gaming or rendering sessions are therefore the main scenario to plan for. If you run long sessions in a warm room or a poorly ventilated case, the fan noise is the trade-off you will hear most.
Rank #4
- 80 PLUS Gold & Cybenetics Platinum Certified - Advanced high efficiency certifications ensure minimal heat and energy waste while delivering clean, efficient power to your system.
- Modular Design - Connect only what’s required, and enjoy clean builds with flexible embossed cables designed for smooth routing and hassle-free cable management.
- 100% Japanese Capacitors - Premium Japanese capacitors deliver superior durability, heat resistance, and reliability compared to conventional capacitors.
- ATX 3.1 & PCIe Gen 5.1 Compliant - GIGABYTE PSUs are engineered to handle extreme power spikes and transient loads from the latest graphics cards.
- Game in Silence - A high-performance 135mm Fluid Dynamic Bearing (FDB) fan delivers quiet airflow with HybridCool Smart Fan Control. Cybenetics LAMBDA A- certified for low noise performance.
Electrical performance
Tom’s Hardware characterises the unit’s electrical performance as average for its class, rather than leading. Specifically, the review reports good minor-rail regulation, 12V regulation of 1.3%, and ripple within ATX limits without standing out. None of these results is a weakness, but none is a reason to buy on its own. The buying case rests mainly on efficiency, T-Guard, and the noise balance at typical loads.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Size, bundle and price
The review flags the 150mm length as a possible fit problem in very compact cases, so measure your case’s power supply space before ordering. It also describes the bundle as sparse and says it lacks mounting screws, so have a set of PSU screws ready for the build.
The $170 price cited in the review applies to the review date, 27 September 2026. Retail prices and availability change, so check the current price before you compare it with alternatives.
Best Value
- 1000W Capactiy with Single +12V Rail
- Supports PCIe Gen 5.1 graphics cards (12+4 Pin)
- Intel ATX 3.1 Certified
- 80 PLUS Platinum Certified
- ATX Form Factor
How it compares with other 1000W units
Tom’s Hardware used three comparison units in its review:
- Corsair RM1000x
- MSI MAG A1000GL PCIE5
- Montech Century II 1050W
The Montech unit is rated at 1050W, so it is not a like-for-like 1000W comparison. Any ranking in the review reflects review-time pricing and the exact revisions tested, so verify both before choosing between them.
Who should buy it
The GIGABYTE GAMING 1000GM PG5 suits a builder who wants a 1000W ATX 3.1 unit with strong measured efficiency, a GPU safeguard, and quiet operation during typical use. It is less suitable if you need the best electrical figures in every category, if you expect sustained full-load use in a hot environment without fan noise, or if your case cannot accommodate a 150mm power supply. Confirm the model code, the current price, and the warranty terms for your region before you order.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
