The Thermaltake Toughpower GF3, with a maximum power of 1650W, is currently the most powerful ATX v3.0 and PCIe 5.0 compatible power supply. Even with a heavily overclocked NVIDIA RTX 4090 and a power-hungry CPU, you won't require extra electricity. This power supply can handle power spikes of up to 3300W! That sums it up perfectly! 

Even with a super-clocked RTX 4090 and an overclocked CPU, this PSU will not overheat. It can power two RTX 4090s at the same time if you have deep cash. It comes with two 12VHPWR plugs. This is the first power supply I've encountered with a pair of PCIe 12+4 pin connectors. Given its maximum power, it has a modest design with a 180mm depth, and the $300 price tag is reasonable for a 1650W beast. 

The GF3 1350W is one of the few high-capacity, Gold-efficiency PSUs in the 80 PLUS program. PSUs, which are often stronger than 1000W, have Platinum or higher efficiency ratings to limit thermal loads, which result in high-speed fan operation and excessive noise production. Despite the fact that the GF3 1350W achieves Platinum efficiency in the Cybenetics scheme, its fan speed profile is aggressively regulated.


Technical Specifications:

  • Manufacturer (OEM): High Power
  • Max Power: 1650W
  • Cybenetics Efficiency: [115V] Cybenetics Platinum (89-91%)
  • 80 Plus Efficiency: Gold
  • Noise: Above 45 dBA, so it doesn’t get a Cybenetics rating
  • Compliance: ATX12V v3.0, EPS 2.92
  • Alternative Low Power Mode support: Yes
  • Power 12V: 1650W
  • Power 5V + 3.3V: 130W
  • Power 5VSB: 15W
  • Cooling: 140mm Hydraulic Bearing Fan [TT-1425 (A1425S12S-2)]
  • Semi-Passive Operation: Yes (Selectable)
  • Modular Design: Yes (Fully)
  • High Power Connectors: 2x EPS (2x cables), 9x PCIe 6+2 pin (6x cables), 2x PCIe 12+4 pin (600W)
  • Peripheral Connectors: 16x SATA (4x cables), 8x 4-pin Molex (2x cables), 1x FDD adapter
  • ATX/EPS Cable Length: 600/750mm
  • Distance between SATA / 4-pin Molex connectors: 150mm
  • In-cable capacitors: No
  • Dimensions (W x H x D): 150 mm x 85 mm x 180 mm
  • Weight: 2.2 kg (4.85 lb)
  • Warranty: 10 years

Box & Bundle



The box is identical to the 1350W unit, with only the capacity description and the PSU photo changed at its face. The ATX v3.0 and PCIe 5.0 compatibility is also highlighted, along with the fan-stop feature, the Japanese capacitors, and the ten-year warranty. Inside the box, the protection is adequate, and the bundle is rich enough, including a pouch for storing the unused modular cables. With the vast amount of modular cables provided, you will surely need it.

A few years ago, 1500-1600W units were much larger, with a depth of 220mm, while this one is only 180mm. This implies you won't need a massive chassis to house it. On the other hand, users who purchase such a powerful power supply require it to power a huge number of components, which necessitates a large enclosure.


Protection Features

OCP (Cold @ 28°C)12V: 194A (141.11%), 11.754V
5V: 33.4A (133.6%), 4.960V
3.3V: 33.1A (132.4%), 3.299V
5VSB: 5A (166.67%), 4.930V
OCP (Hot @ 41°C)12V: 192A (140.38%), 11.753V
5V: 33.3A (133.2%), 4.954V
3.3V: 33A (132.0%), 3.293V
5VSB: 4.9A (163.33%), 4.929V
OPP (Cold @ 33°C)2163.28W (131.11%)
OPP (Hot @ 43°C)2001.22W (121.29%)
OTPNo (>200 °C @ 12V heat sink)
SCP12V to Earth: ✓
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓
PWR_OKAccurate but lower than 16 ms
NLO✓
SIPSurge: MOV
Inrush: NTC Thermistor & Bypass relay
Under cold and hot temperatures, the 12V rail's OCP is set at more than 190A. This is excessive. I'd keep it at 180A at most. Minor rails have high OCP triggering points as well, but they don't appear to have any issues because load management and ripple suppression are adequate. Protection is suitably adjusted over power, especially in high temperatures. I doubt many users will be able to drive this PSU to its OPP triggering points.
Performance Rating
The relative performance is adequate but not exceptional enough to cause concern among competitors. Nonetheless, given its characteristics, the PSU is offered at a reasonable price, resulting in a great performance-to-price ratio.

Efficiency Rating
The graph below depicts the power supply's average efficiency over its operational temperature range of 30°C to 32°C.



Value and Conclusion

The Thermaltake Toughpower GF3 1650 W is the most economical ATX v3.0 and PCIe 5.0 compatible power supply with over 1500 W of peak power. It includes two 12VHPWR cables/connectors, each set for full power output (600 W), allowing it to support two NVIDIA RTX 4090 graphics cards with their power limits set to maximum.  The Thermaltake GF3 1650W boasts several important features, including a low price, a large power output, ATX v3.0 and PCIe 5.0 compatibility, and a pair of 12VHPWR connectors that can deliver 600W each if necessary. So far, there aren't many power supplies that can accommodate two 12VHPWR connectors and power two NVIDIA RTX 4090 graphics cards.  It may not impress in terms of performance when compared to higher-end and much more expensive units with comparable capacity, but what counts most to most users is the price-per-performance ratio, and the high-capacity GF3 model does not appear to have a worthy opponent.