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be quiet! Straight Power 11 BN281

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be quiet! Straight Power 11 BN281
Straight Power (high efficiency)80+ Gold5 year warranty
450 W
24+8 (4+4) pin
550 W
24+8 (4+4) pin
650 W
24+8 (4+4) pin
750 W
24+8+8(4+4) pin
850 W
24+8+8(4+4) pin
1000 W
24+8+8(4+4) pin
Main
Power550 W
Form factorATX
Specs
PFCactive
Efficiency93 %
Cooling systemactive (fan)
Fan size135 mm
Fan bearinghydrodynamic
Certification80+ Gold
ATX12V version2.4
EPS12V version2.92
Power connectors
MB/CPU power supply24+8 (4+4) pin
SATA9
MOLEX3
PCI-E 8pin (6+2)2
Cable systemmodular
Braided wires
Cable length
MB600 mm
CPU700 mm
SATA1000 mm
PCI-E600 mm
Max. power
+3.3V24 А
+5V24 А
+12V118 А
+12V218 А
+12V320 А
+12V420 А
-12V0.3 А
+5Vsb3 А
+12V549 W
+3.3V +5V130 W
General
Over voltage protection (OVP)
Over power protection (OPP)
Short circuit protection (SCP)
ProtectionOTP, OCP, SIP, UVP
Noise level17 dB
Manufacturer's warranty5 years
Dimensions (HxWxD)86x150x160 mm
Official Websitebequiet.com
Added to E-CatalogMay 2018
The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
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be quiet! Straight Power 11 power supply unit 550 W 20+4 pin ATX ATX Black BN281

Virtually inaudible operation thanks to a SilentWings® 3 135mm fan. Big funnel-shaped fan opening of the PSU case for high airflow intake. Wire-free on the DC side inside the PSU for enhanced cooling and longevity. Full cable management for maximum build flexibility. 80PLUS® Gold certification with an efficiency of up to 93%. Advanced stability and... morevoltage regulation thanks to LLC, SR and DC-to-DC. Four high-performance 12V-rails. Powerful multi-GPU support with two PCI-Express connectors. Japanese 105°C-rated capacitors ensure stability and reliability. Power signal stability unmatched in its class. ErP and Energy Star 6.1 ready. Product conception, design and quality control in Germany. World Class Quiet and Efficiency. be quiet! Straight Power 11 550W raises the bar for systems that demand virtually inaudible operation without power quality compromises. This PSU is clearly the best choice for super silent systems.. Power. Power protection features. Over current, Over power, Over voltage, Overheating, Short circuit, Under voltage. Hold time. 18.9 ms. Efficiency. 93%. Max output current (+5Vsb). 3 A. Max output current (-12V). 0.3 A. Max output current (+5V). 24 A. Max output current (+12V3). 20 A. Max output current (+12V4). 20 A. Max output current (+12V2). 18 A. Max output current (+12V1). 18 A. Max output current (+3.3V). 24 A. Combined power (+5Vsb). 15 W. Combined power (-12V). 3.6 W. Combined power (+5V). 130 W. Combined power (+12V). 549.6 W. Combined power (+3.3V). 130 W. Power Factor Correction (PFC) type. Active. Power factor. 0.99. Input current. 8 A. AC input frequency. 50 - 60 Hz. AC input voltage. 100 - 240 V. Peak power. 600 W. Total power. 550 W. Ports & interfaces. Cabling type. Fully-Modular. Floppy disk drive connector. Yes. CPU power cable length. 70 cm. CPU power connector (4+4 pin). Yes. PCI Express power cable length. 60 cm. PCI Express power connectors (6+2 pin). 2. SATA power cable length. 550 mm. Number of PATA power connectors. 3. Number of SATA power connectors. 9. Motherboard power cable length. 60 cm. Motherboard power connector. 20+4 pin ATX. Performance. Bearing technology. FDB. Silent mode. Yes. EPS version. 2.92. ATX version. 2.4. 80 PLUS certification. 80 PLUS Gold. Power supply unit (PSU) form factor. ATX. Purpose. PC. Design. On/off switch. Yes. Illumination. No. Number of fans. 1 fan(s). Fan diameter. 13.5 cm. Product colour. Black. Certificates. Certification. CE, FCC, TÜV, cTUVus, RCM, BSMI, CU. Compliance certificates. RoHS. Weight & dimensions. Weight. 1.51 kg. Height. 86 mm. Depth. 160 mm. Width. 150 mm. Packaging data. Package weight. 2.76 kg. Package height. 102 mm. Package depth. 328 mm. Package width. 248 mm. Manual. Yes. Technical details. Sustainability certificates. ENERGY STAR. Logistics data. Harmonized System (HS) code. 84733020. Other features. Cable management. Yes. Noise level (full-load mode, 100%). 17.22 dB. Noise level (quiet mode, 50%). 9.46 dB. Noise level (silent mode,. 9.02 dB.
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£101.99
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be quiet! Straight Power 11 850W Platinum power supply unit 20+4 pin ATX ATX Black BN308

80 PLUS® Platinum certification with an outstanding efficiency of up to 94%. Virtually inaudible operation thanks to a Silent Wings 3 135mm fan. Big funnel-shaped fan opening of the PSU case for high airflow intake. Wire-free on the DC side inside the PSU for enhanced cooling and longevity. Modular cables for maximum build flexibility. Advanced sta... morebility and voltage regulation thanks to LLC, SR and DC-to-DC. Four high-performance 12V rails. Powerful multi-GPU support with four PCI-Express connectors. Japanese 105°C-rated capacitors ensure stability and reliability. Power signal stability unmatched in its class. ErP and Energy Star 7.0 ready. Product conception, design and quality control in Germany. 80 PLUS® PLATINUM CERTIFIED. One of the highest efficiency certificates available. Straight Power 11 Platinum 850W is certified with 80 PLUS Platinum efficiency, reaching up to 94%. This provides lots of benefits for your high-end system, including less power consumption and an overall cooler and quieter operation. The standby drain is below 0.1 watts.. SILENT WINGS 3 FAN. Provides virtually inaudible operation. The high-end Silent Wings 3 fan delivers best-of-class airflow yet produces very little noise. This is thanks to its unique, optimized fan blade design along with an advanced fluid-dynamic bearing and 6-pole fan motor that largely eliminates operational noise, has a super-long life and minimal power consumption.. FUNNEL-SHAPED FAN OPENING. Higher cooling performance. The fan inlet of the Straight Power 11 Platinum 850W is funnel-shaped. It causes an increased throughput of air which benefits to a higher cooling performance.. WIRE-FREE DESIGN INSIDE THE PSU. Pushing the longevity of components to a maximum. An absolute innovation: The Straight Power 11 Platinum 850W is wire-free on the DC side inside the PSU body. This results in improved cooling airflow and less signal disturbance, simply because of a lack of wiring, and ultimately pushes the lifetimes of the components to a maximum.. MODULAR CABLES. Utmost convenience and compatibility. Thanks to the modular cables, all cables that serve no purpose in the system are left out. For this reason, systems always appear very tidy. At the same time installation is performed much more conveniently. A smoother airflow results from the uncluttered layout of the system, which means lower noise and temperatures prevail inside the case.. STATE-OF-THE-ART TECHNOLOGIES. Rock-steady signal stability and efficiency. Experience the most technologically advanced power supply be quiet! has ever built! Using an advanced full bridge, LLC and Synchronous Rectifier (SR) technology it provides unmatched signal stability and unbeatable power efficiency. The DC-to-DC conversion for tight voltage regulation, even under heavy cross-loading conditions ensures reliable operation for the next generation of processors and graphics cards.. JAPANESE 105° CAPACITORS. A testament to high quality. Only the best components are
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£152.99
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be quiet! Straight Power 11 850W Platinum power supply unit 20+4 pin ATX ATX Black BN308

80 PLUS® Platinum certification with an outstanding efficiency of up to 94%. Virtually inaudible operation thanks to a Silent Wings 3 135mm fan. Big funnel-shaped fan opening of the PSU case for high airflow intake. Wire-free on the DC side inside the PSU for enhanced cooling and longevity. Modular cables for maximum build flexibility. Advanced sta... morebility and voltage regulation thanks to LLC, SR and DC-to-DC. Four high-performance 12V rails. Powerful multi-GPU support with four PCI-Express connectors. Japanese 105°C-rated capacitors ensure stability and reliability. Power signal stability unmatched in its class. ErP and Energy Star 7.0 ready. Product conception, design and quality control in Germany. 80 PLUS® PLATINUM CERTIFIED. One of the highest efficiency certificates available. Straight Power 11 Platinum 850W is certified with 80 PLUS Platinum efficiency, reaching up to 94%. This provides lots of benefits for your high-end system, including less power consumption and an overall cooler and quieter operation. The standby drain is below 0.1 watts.. SILENT WINGS 3 FAN. Provides virtually inaudible operation. The high-end Silent Wings 3 fan delivers best-of-class airflow yet produces very little noise. This is thanks to its unique, optimized fan blade design along with an advanced fluid-dynamic bearing and 6-pole fan motor that largely eliminates operational noise, has a super-long life and minimal power consumption.. FUNNEL-SHAPED FAN OPENING. Higher cooling performance. The fan inlet of the Straight Power 11 Platinum 850W is funnel-shaped. It causes an increased throughput of air which benefits to a higher cooling performance.. WIRE-FREE DESIGN INSIDE THE PSU. Pushing the longevity of components to a maximum. An absolute innovation: The Straight Power 11 Platinum 850W is wire-free on the DC side inside the PSU body. This results in improved cooling airflow and less signal disturbance, simply because of a lack of wiring, and ultimately pushes the lifetimes of the components to a maximum.. MODULAR CABLES. Utmost convenience and compatibility. Thanks to the modular cables, all cables that serve no purpose in the system are left out. For this reason, systems always appear very tidy. At the same time installation is performed much more conveniently. A smoother airflow results from the uncluttered layout of the system, which means lower noise and temperatures prevail inside the case.. STATE-OF-THE-ART TECHNOLOGIES. Rock-steady signal stability and efficiency. Experience the most technologically advanced power supply be quiet! has ever built! Using an advanced full bridge, LLC and Synchronous Rectifier (SR) technology it provides unmatched signal stability and unbeatable power efficiency. The DC-to-DC conversion for tight voltage regulation, even under heavy cross-loading conditions ensures reliable operation for the next generation of processors and graphics cards.. JAPANESE 105° CAPACITORS. A testament to high quality. Only the best components are
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Delivery: in United Kingdom
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£162.99
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Series be quiet! Straight Power (high efficiency)Compare using chart →
be quiet! Straight Power 12 BN339
from £198.99 
1200 W, 24+8+8(4+4) pin, 4 x 6+2 pin, 2 x 16 pin, SATA 9, Molex 2, ATX, modular, Efficiency 93 %, certificate 80+ Platinum, warranty 10 years
be quiet! Straight Power 12 BN338
from £169.99 
1000 W, 24+8+8(4+4) pin, 4 x 6+2 pin, 1 x 16 pin, SATA 9, Molex 2, ATX, modular, Efficiency 93 %, certificate 80+ Platinum, warranty 10 years
be quiet! Straight Power 12 BN337
from £148.94 
850 W, 24+8+8(4+4) pin, 4 x 6+2 pin, 1 x 16 pin, SATA 9, Molex 2, ATX, modular, Efficiency 93 %, certificate 80+ Platinum, warranty 10 years
be quiet! Straight Power 12 BN336
from £127.99 
750 W, 24+8+8(4+4) pin, 4 x 6+2 pin, 1 x 16 pin, SATA 9, Molex 2, ATX, modular, Efficiency 93 %, certificate 80+ Platinum, warranty 10 years
be quiet! Straight Power 11 BN284
from £138.06 
850 W, 24+8+8(4+4) pin, 4 x 6+2 pin, SATA 11, Molex 4, ATX, modular, Efficiency 93 %, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 12 BN340
from £212.99 
1500 W, 24+8+8(4+4) pin, 4 x 6+2 pin, 2 x 16 pin, SATA 9, Molex 2, ATX, modular, Efficiency 93 %, certificate 80+ Platinum, warranty 10 years
be quiet! Straight Power 10 BN231
from £108.82 
500 W, 24+8 (4+4) pin, 2 x 6+2 pin, SATA 9, Molex 3, ATX, Efficiency 93 %, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 11 BN280
from £98.99 
450 W, 24+8 (4+4) pin, 2 x 6+2 pin, SATA 8, Molex 3, ATX, modular, Efficiency 93 %, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 11 BN281
from £101.99 
550 W, 24+8 (4+4) pin, 2 x 6+2 pin, SATA 9, Molex 3, ATX, modular, Efficiency 93 %, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 11 BN282
from £118.99 
650 W, 24+8 (4+4) pin, 4 x 6+2 pin, SATA 9, Molex 3, ATX, modular, Efficiency 93 %, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 11 BN283
from £127.05 
750 W, 24+8+8(4+4) pin, 4 x 6+2 pin, SATA 11, Molex 4, ATX, modular, Efficiency 93 %, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 11 BN285
from £157.10 
1000 W, 24+8+8(4+4) pin, 6 x 6+2 pin, SATA 11, Molex 4, ATX, modular, Efficiency 93 %, mining, certificate 80+ Gold, warranty 5 years
be quiet! Straight Power 11 Platinum BN305
from £118.99 
500 W, 24+8 (4+4) pin, 2 x 6+2 pin, SATA 9, Molex 3, ATX, modular, Efficiency 94 %, certificate 80+ Platinum, warranty 5 years
be quiet! Straight Power 11 Platinum BN306
from £137.99 
650 W, 24+8+8(4+4) pin, 4 x 6+2 pin, SATA 9, Molex 3, ATX, modular, Efficiency 94 %, certificate 80+ Platinum, warranty 5 years
be quiet! Straight Power 11 Platinum BN308
from £203.99 
850 W, 24+8+8(4+4) pin, 4 x 6+2 pin, SATA 11, Molex 4, ATX, modular, Efficiency 94 %, certificate 80+ Platinum, warranty 5 years
Model overview based on user reviews  
The "be quiet! Straight Power 11" power supply unit is highly praised for its exceptional silence and quality build. Users appreciate its fully modular design and long cables, allowing for flexible and tidy installations. Despite some minor issues like stiff wires and unclear instructions, the PSU is considered reliable, with stable voltage lines under load. However, there are isolated reports of defective units and unexpected shutdowns, though these were swiftly addressed by the service center with replacements. Overall, the PSU is valued for its quiet operation and durability, making it a recommended choice for those seeking a high-quality power supply.
Pros

Cons

User reviews 5
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Ask to check (or check immediately) the power supplies in the store!
15 May 2020 
Bought this power supply hoping for quiet operation. Upon connection, a squeal appeared. Got a defective unit, was very surprised and upset by this. The next day, took it back to the store.
- Truly quiet operation
- Modular
- Long cables
- Stiff wires
- Loud sound of the switch when turning the computer on or off.
Viktor: use be quiet! BN282 less than month
Comments 1
Discuss
 Show Original
So far, it costs its 3500 UAH. We will see further.
3 March 2020 
Ordered on F.ua. 750 watts[283].
Everything is fine, it came new in sealed packaging via NP.
Quiet, the relay click is inaudible in the room (it is very quiet on its own). Haven't given it a proper load yet, don't have the means, it's in a PC with a load up to 350 watts. The 12V, 5V, and 3V lines do not sag, the values are stable with a margin.
I'll add a comment later after installing in a new computer.
Quality, modularity+-, it weighs normally :)),
Completeness+-, length and number of cables. Power around 700 watts. I was ready to pay this money for it, the most important part in a PC.
The instructions are not clear. All the sockets are marked in their own way, but there is no clear information on them in the instructions, I had to google ... in fact, nothing complicated. Why the metal braid is unclear, tight.
K10: use be quiet! BN283 less than month
Comments 5
Discuss
 Show Original
I recommend for purchase
30 July 2019 
I bought a Gigabyte G750H to replace it for my assembly and went nuts from the level of silence that this power supply shows. Well done Germans, they did everything very high quality inside and out. Long connection wires allowed me to lay cables in a way that the previous PSU did not work out.
Long-awaited silence, long cables, fully modular
-
Alex Chugaev: use be quiet! BN283 less than month
Comments 3
Discuss
 Show Original
3 out of 5 user review(s) shown
2 more user review(s)

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