The Gigabyte Gaming 1000GM PG5 is a 1,000W, fully modular ATX 3.1 power supply with strong reported efficiency and a useful connector-temperature feature. Its main trade-off is noise: in tests reported September 27, 2026, the fan reached 54.5 dB(A) at sustained 1,000W in roughly 45°C ambient. That makes the results most relevant to builders who want a high-output unit and can live with a loud fan under heavy, hot conditions.
What the Gigabyte Gaming 1000GM PG5 offers
The unit is compliant with ATX 3.1 and PCIe 5.1 design guides. It has a native 12V-2x6 cable rated for 600W, and its packaging carries 80 PLUS Gold branding. The power supply is also reported to hold 80 PLUS Platinum and Cybenetics ETA Platinum certifications.
The Gaming 1000GM PG5 is built on an HEC platform. It measures 150 × 150 × 86 mm (length × width × height), and all of its cables are modular. Its 135 mm fan uses a fluid dynamic bearing. The 12V-2x6 cable has a light-gray front section, which makes incomplete insertion easier to spot.
What T-Guard is designed to do
T-Guard uses thermistors to monitor the temperature of the 12V-2x6 connector. If the system detects abnormal heating, its described response is to cut power to the GPU while leaving the rest of the PC running. A reboot is required to restore GPU power.
That is a targeted response: the described behavior shuts down power to the graphics card, not the entire computer. T-Guard is a feature of the Gaming 1000GM PG5; it should not be confused with the older Gigabyte UD1000GM PG5 or UD1000GM PG5 V2 model names.
Efficiency and noise across the two test conditions
At 25°C ambient, average efficiency was 92.6% at 230VAC and 90.6% at 115VAC. In the roughly 45°C test, the averages were 91.8% and 89.8%, respectively. At sustained 1,000W, efficiency was lower in the hotter test at both input voltages.
| Ambient test condition | Average efficiency at 230VAC | Average efficiency at 115VAC | Efficiency at 1,000W, 230VAC | Efficiency at 1,000W, 115VAC | Fan noise at sustained 1,000W |
| 25°C | 92.6% | 90.6% | 91.0% | 88.5% | 48.2 dB(A) |
| Roughly 45°C | 91.8% | 89.8% | 89.9% | 87.4% | 54.5 dB(A) |
The warmer full-load test also produced primary and secondary heatsink readings of 88°C and 82°C. The fan stayed stopped up to about 300W in the reported test conditions; at 25°C ambient, noise reached about 41 dB(A) at 800W before climbing to 48.2 dB(A) at 1,000W. Under roughly 45°C ambient, it measured 47.2 dB(A) at 800W.
Electrical results and build details
Across 20% to 100% load, voltage regulation measured 0.5% on the 3.3V rail, 0.5% on 5V and 1.3% on 12V. Maximum ripple—the small AC variation superimposed on a DC rail—was 26 mV on the 3.3V and 5V rails and 48 mV on 12V. Those reported maxima are below the stated ATX limits of 50 mV for the minor rails and 120 mV for 12V.
The unit’s ten-year warranty is a substantial stated coverage period. At 150 mm long, the chassis may also make installation tighter in very compact cases, so check PSU clearance against the case’s dimensions before choosing it.
Who should consider it?
The Gaming 1000GM PG5 makes the most sense for a high-demand PC build where the 1,000W rating, modular cabling and native 12V-2x6 connection fit the parts list. Its reported efficiency figures are strong, and T-Guard is designed to respond to abnormal connector heating. The practical compromise is clear in the hot full-load result: 54.5 dB(A) is a lot of fan noise to accept if the system will regularly run near maximum output in a warm environment.
The listed US review-time price was $170 on September 27, 2026.
