Power Supply Quality
The electrical performance of the Be quiet! Straight Power 12 750W PSU is very good overall. It achieves precise voltage regulation, with a deviation of only 0.9% on the 12V rail and even tighter control on the 3.3V and 5V rails. Ripple suppression is also well-managed, with maximum ripple values of 28 mV on the 12V rail, and 16 mV on the 3.3V and 5V rails, reflecting the PSU's ability to maintain clean power delivery under various loads and high ambient temperatures. While impressive, these results are consistent with what is typically seen in high-quality power supplies of this caliber.
| Main Output | ||||||||
| Load (Watts) | 151.73 W | 378.32 W | 565.76 W | 752.35 W | ||||
| Load (Percent) | 20.23% | 50.44% | 75.44% | 100.31% | ||||
| Amperes | Volts | Amperes | Volts | Amperes | Volts | Amperes | Volts | |
| 3.3 V | 2.2 | 3.34 | 5.49 | 3.33 | 8.24 | 3.32 | 10.98 | 3.32 |
| 5 V | 2.2 | 5.09 | 5.49 | 5.08 | 8.24 | 5.07 | 10.98 | 5.05 |
| 12 V | 10.98 | 12.13 | 27.45 | 12.1 | 41.18 | 12.06 | 54.9 | 12.03 |
| Line | Regulation (20% to 100% load) | Voltage Ripple (mV) | |||||
| 20% Load | 50% Load | 75% Load | 100% Load | CL1 12V | CL2 3.3V + 5V | ||
| 3.3V | 0.8% | 14 | 8 | 12 | 16 | 10 | 12 |
| 5V | 0.8% | 12 | 8 | 14 | 16 | 8 | 14 |
| 12V | 0.9% | 14 | 18 | 24 | 28 | 26 | 26 |
During our routine evaluation, we examine the fundamental protection features of all power supply units we review, including Over Current Protection (OCP), Over Voltage Protection (OVP), Over Power Protection (OPP), and Short Circuit Protection (SCP). The Be quiet! Straight Power 12 750W PSU successfully passed all essential protection tests, validating its ability to safeguard itself and attached components under potential risk conditions. It showed a liberal setting for Over Current Protection (OCP) on the 3.3V and 5V rails, with activation points at 120% and 122%, respectively. The trigger point for the OCP on the 12V rail is somewhat more generous, at 130%, which, while higher, is still within a reasonable range for an ATX 3.0 compliant PSU. Additionally, the Over Power Protection (OPP) kicks in at 126% of the unit's rated capacity, indicating a high tolerance level designed to ensure stability during power excursions and protection under various operational stresses.
Conclusion
The Straight Power 12 750W PSU stands out as proof to Be quiet!’s capability to deliver high-quality engineering and exceptional performance. Backed by a 10-year warranty and with a reasonable power output, it seemingly is a wise choice for anyone looking to build or upgrade to a mid- to high-range gaming PC setup. While it offers an alternative for those seeking an ATX 3.0 compliant unit without having to resort to a product with an unnecessarily high power output, PC builders need to be careful with the balance of their system’s components. The 750 Watt version of the Straight Power 12 could theoretically power even the most powerful GPU currently available requiring one 600W connector but that would leave little headroom for the CPU and the rest of the system.
The design and build quality of the Straight Power 12 are nothing short of excellent. The fully modular design, coupled with all-black, nylon-sleeved cables, not only enhances the aesthetic appeal of any build but also facilitates easy cable management. The use of high-quality components from reputable manufacturers like Rubycon and Nippon Chemi-Con further underscores Be quiet!'s commitment to reliability and longevity. The included SilentWings 3 135mm fan, renowned for its quiet operation and efficiency, assists the PSU's ability to maintain low noise levels without compromising thermal performance.
On the electrical performance front, the Straight Power 12 excels with tight voltage regulation and exceptional ripple suppression. The PSU's efficiency meets the 80Plus Platinum standard, a clear indicator of its superior power conversion capabilities which lead to superior thermal performance and a slight nod towards energy savings and reduced operational costs. The OCP and OPP settings are slightly more generous than what is typically expected, allowing for a bit of headroom that could be particularly useful in high-demand scenarios and when dealing with multiple power excursions. This approach to electrical protection does not compromise the unit's safety or stability, providing peace of mind to users pushing their systems to the limit.
Conclusively, the Be quiet! Straight Power 12 750W PSU represents a solid investment for any PC builder or enthusiast. Its blend of efficiency, build quality, and electrical performance, backed by a reputable brand and a 10-year warranty, offers a compelling value proposition. While its current $140 retail price point is positioned higher than expected, especially compared to other models in the Straight Power 12 series, the quality and performance it delivers are undeniable. For those in the market for a reliable, efficient, and quiet power supply, the Straight Power 12 750W is undoubtedly worth considering, particularly if found during a sale.
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