
The Thermaltake Toughpower GF A3 Gold 750W - TT Premium Edition is an ATX 3.0 fully modular power supply featuring a hybrid fan mode for passive operation at low loads. Despite its promising features, our testing revealed significant issues with reliability.
We tested two samples, both of which failed before completing our evaluations. The first unit failed during the brownout tests at 0°C, and the second unit failed during the brownout tests at 40°C. We were not able to collect data for the 40°C tests as both units failed before reaching this stage of testing. As of time of publication, we are currently awaiting a response from Thermaltake regarding these failures and will provide updates when available. Due to these issues, we cannot recommend this power supply at this time.
WHAT YOU NEED TO KNOW
THE GOOD
- Warranty
It comes with a 10-year warranty.
- Efficiency
Despite the limited testing, it demonstrated near-Platinum efficiency at various load points, although it officially meets Gold standards.
THE BAD
- Power Excursion
Voltage regulation was generally good, but the 12V rail often fell outside specifications during tests.
- Failed Testing
Testing was incomplete due to hardware failures. This happened with two different samples.
THE REST
- Overall
Labs does not recommend this PSU. Both units failed before completing the full test suite. As a result, we cannot ensure its performance under high loads or its potential impact on your computer.
The Thermaltake Toughpower GF A3 Gold 750W includes a 120mm fluid bearing fan that should provide adequate cooling, though it may be less powerful or quiet compared to a 140mm fan. The Smart Zero Fan feature ensures the fan remains off until the load exceeds 40%, reducing unnecessary noise.
The PSU comes with sufficient connections to power the CPU, a 12VHPWR connector, another PCIe device, and several SATA devices. The packaging includes standard accessories: the power supply unit, an AC power cord, mounting screws, cable straps, a cable pouch, a fabric sleeve for the PSU, and a user manual. The cables are moderately flexible with regular insulation, and the 12VHPWR cable features a sleeve, which is a nice touch given its visibility in a computer case. However, the 12VHPWR cable is rated for only 300W, which may be inadequate for some GPUs.
Thermaltake specifies an operating temperature of 0°C to 45°C and a storage temperature range of -40°C to 70°C, though we cannot verify these ranges in our tests.
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Front of the box.
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Power input side of the PSU.

Top of the PSU displaying the fan.

Bottom of the PSU displaying the specifications.
+12 V | +5 V | +3.3 V | +5 Vsb | -12 V | |
---|---|---|---|---|---|
CURRENT | 62.5 A | 20 A | 20 A | 3 A | 0.3 A |
WATTAGE | 750 W | 100 W | 15 W | 3.6 W | |
750 W |
Please note that the above ratings are manufacturer advertised specifications.
The Thermaltake Toughpower GF A3 Gold 750W offers a 10-year warranty and is certified 80PLUS Gold, with Cybenetics Platinum efficiency ratings. Although it approaches Platinum efficiency at several load points, it consistently meets Gold requirements.
The PSU includes all standard protections and features a hybrid mode, controlled by a switch on the back. Due to the units failing during testing, we could not fully assess the Over Power Protection (OPP) or the Over Current Protection (OCP) for the 5vsb and -12V rails. The OCP results we did obtain were quite high.
During testing, the power supply exhibited considerable voltage ripple on the 12V rail, with similar results on the 5V and 3.3V rails, although all were within ATX specifications. Voltage regulation was generally good, but the 12V rail’s performance during load regulation and excursions was less than stellar, often falling outside specifications despite surviving most tests.
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The Thermaltake Toughpower GF A3 750W demonstrated near-Platinum efficiency at various load points, although it officially meets Gold standards. It showed strong resilience to brownouts, with survival times of 18ms at 155V and 17ms at 230V, and took even longer for voltages to drop. Unfortunately, due to the premature failures, we only obtained data for the 12V, 5V, and 3.3V rails. The OCP results for the 12V rail were notably high, reaching up to 170%, which could be beneficial for handling heavy loads but also indicates a potential risk for reliability.
