be quiet! System Power 9 CM BN302 (BN302)
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Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog be quiet! 2026 - new arrivals, bestsellers, and the most relevant models be quiet!.
A couple of days ago, I bought this PSU, and so far, I am satisfied with it. I got it for 5300 considering bonuses on the online trade, whereas in other stores it costs around 7k. -Price -Quality of workmanship -Semi-modularity -24pin and 8pin CPU cables with black sleeving -Flat cables for the graphics card and peripherals -Quiet -Excellent circuitry, almost at the level of seasonic)) -Smell in the first day or two of use -Had difficulties connecting the 24 and 8 pin to the motherboard, as these cables are a bit stiff -Strange connection of SATA devices, as the branching goes directly from the bundle, and it's impossible to connect to the quick-release SSDs on the case, only the very last SATA, which is straight  Valeriy Elykomov: use be quiet! BN302 less than month |
Compact, practical, good
be quiet! System Power 9 CM is a series of semi‑modular power supplies from the renowned German brand. In practice, it’s a sensible saving compared to fully modular counterparts, since the CPU and motherboard power cables will be used anyway. The two cables mentioned above are tucked into a nylon sleeve. The rest are flat, flexible ribbon‑style cables.
Divide and conquer
System Power 9 CM is built on an HEC platform with a modern DC-DC conversion design. The main +12 V rail is split into two sub‑rails for better voltage stability. In the 600 W model, these are 28 A and 22 A, respectively. The stronger rail feeds the graphics card, while the weaker one powers the CPU and motherboard.
Slow‑spinning fan
The hold‑up high‑voltage capacitor is a Taiwanese 85°C Teapo. The fan is be quiet!’s first‑gen Silent Wings with a grooved Rifle Bearing, which lasts longer than a basic Sleeve Bearing. Up to half PSU load, the fan noise stays ultra‑low at about 10 dB.
Total protection
A full set of electrical protections is implemented: against overheating, overload, voltage surges, and short circuit. PSU efficiency reaches 89%, earning it the 80 PLUS Bronze certification. It only works on 220 V mains, not 110 V, which isn’t an issue in our region. There’s also a more affordable non‑modular sibling to the semi‑modular be quiet! System Power 9 CM.