The be quiet! Straight Power 12 750W is a 750W fully modular, ATX 3.0 power supply. It comes equipped with a single fan mode and is priced at an MSRP of $189.99 USD.
The included cables offer braided and sleeved insulation, making them both durable and flexible. However, due to the larger size of the power supply and longer cables, cable management could be a bit tricky, especially in smaller cases.
In terms of performance, the unit excelled in most tests, particularly during power excursion tests. Overall, we recommend this power supply for its high quality cables and robust excursion handling.
WHAT YOU NEED TO KNOW
THE GOOD
- Price-to-Performance
It performed well across the majority of tests, and when found on sale, it’s a worthwhile purchase.
- Cables
The cables are very flexible. They are braided and have sleeved insulation for durability and ease of installation.
THE BAD
- Nothing at the time of writing
THE REST
- Overall
The Straight Power 12 750W is a reliable power supply that performed well in most of the tests conducted. Its standout features include high-quality cables and strong performance during power excursion tests, making it a solid recommendation.
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The be quiet! Straight Power 12 750W is an ATX form factor power supply that comes with minimal accessories - only a few zip ties and the necessary mounting screws are included. The cables, as mentioned earlier, are highly flexible with braided and sleeved insulation. Both the cables and the power supply are on the larger side, which may post a challenge in smaller cases.
The power supply is equipped with a 135 mm fluid dynamic bearing fan, marketed as 'Silent Wings'. The power ratings and specifications meet expectations for this price range.
On the be quiet! technical data webpage, they specify an Operating Temperature of up to 40°C, though we cannot verify this through testing.
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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.
Side of the PSU displaying the specifications.
| +12 V | +5 V | +3.3 V | +5 Vsb | -12 V | |
|---|---|---|---|---|---|
| CURRENT | 62.5 A | 25 A | 25 A | 3 A | 0.3 A |
| WATTAGE | 750 W | 130 W | 15 W | 3.6 W | |
| 750 W | |||||
Please note that the above ratings are manufacturer advertised specifications.
The Straight Power 12 750W includes a single fan mode. The power supply also comes with all standard protections and is backed by a 10-year warranty, as is typical for power supplies of this class.
In terms of performance, the Straight Power 12 750W excelled in most areas. Load regulation was solid, with the 12V rail maintaining a steady voltage above 12V and only a slight 0.119V drop across the full 750W output. This result is well within the ATX specifications. However, there was a notable high voltage ripple on the 12V rail, with a peak-to-peak ripple of 75 mV.
The 5V and 3.3V rails had ripples of 34 mV and 37 mV, respectively, which are also within ATX specifications but higher than average compared to other units testing.
The power supply performed particularly well during power excursion tests, maintaining stability even under the high demands of the latest high power GPUs.
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The Straight Power 12 750W is 80PLUS Platinum certified, specifying 92% efficiency at 50% load. This was confirmed by our testing with the exception of missing the efficiency targets at 50% load by up to 0.8% efficiency. Although this is a relatively minor discrepancy from the efficiency rating. Overall, the unit performed efficiently in the low 90% range across most load tests.
During brownout tests, the power supply proved resilient, handling a 16 ms brownout at full load for 115V and 14 ms for 230V. The voltages remained steady until the 22 ms brownout.
All protection features triggered as expected at around 140-150% for the main rails, with the OPP engaging at 164% of the rated load. The 12V rail, managed to deliver up to 90A, or 144% of its rated capacity. This makes the unit capable of handling more strenuous loads compared to similarly rated power supplies, though it may take longer to shut down in the event of a fault.
