be quiet! Straight Power 11 Platinum 550W raises the bar for systems that demand virtually inaudible operation and outstanding efficiency.
- 80 PLUS® Platinum efficiency (up to 93,8%)
- Virtually inaudible Silent Wings 3 135mm fan
- Funnel-shaped fan opening of the PSU case for high airflow intake
- Wire-free inside the PSU on the DC side for enhanced cooling and longevity
- Modular cables for maximum build flexibility
- Powerful multi-GPU support with two PCI-Express connectors
- Japanese 105°C-rated capacitors ensure stability and reliability
- ErP and Energy Star 7.0 ready
- 5-year manufacturer’s warranty
80 Plus Platinum Certified
One of the highest efficiency certificates available
Straight Power 11 Platinum 550W is certified with 80 PLUS Platinum efficiency, reaching up to 93,8%. 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 550W 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 550W 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.
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.
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 used in Straight Power 11 Platinum 550W. That is why we have built only high-quality Japanese capacitors into the PSU chassis. They are rated to 105°C, ensuring stability, reliability and a long operating life.
- Form Factor: ATX
- Modular: Fully Modular
- Series: Be Quiet! Straight Power 11
- Compatability: ATX 12V v2.51
- Wattage: 550 W
- Connectors: "1 x ATX-Motherboard (20+4-pin)
1 x P4+4 (CPU)
2 x PCI-e 6+2-pin (GPU)
3 x PATA 4-pin
9 x SATA 15-pin (HDD, Drives)
1 x FDD (Floppy)"
- Rail Design: Quad +12V
- AC Input: AC 100-240 V
- PFC: Active PFC
- Fan Type: Silent Wings 3 135mm fan (fluid-dynamic bearing)
- #Hide#Fan Bearing: Fluid / Hydraulic Bearing
- Noise: dB(A) at 20% load: 9.0
dB(A) at 50% load: 9.6
dB(A) at 100% load: 14.9
- 80+ Certification: 80+ Platinum
- Efficiency: up to 93.8%
- MTBF: "100,000 hours"
- Protection: Over current
- Features: See Overview
- Weight/Dimensions: 1.66 kg
160 x 150 x 86 mm
- Warranty: 5 Years
Free shipping is available to all UK residents.
These orders will be sent on a Royal Mail 48 hour tracked service. If you require a more immediate delivery service, we use DHL. However, this courier service will incur an extra cost as stated at the checkout.
We also use DHL/Royal Mail for all European shipments, if you require a European delivery service please select your country at the check out for a shipping price. For international shipments outside of Europe, please contact us directly for a bespoke quote.
We understand that occasionally products may need to be returned to us, but we are here to help make the process easier.
For all returns to Blackmore IT you will need to complete a return merchandise authorisation (RMA) form in order for us to process your refund or replacement during the product's warranty period. Please print this return documentation by clicking here and ensure you include this documentation with a copy of your proof of purchase within the return.
If you need to return your purchase from us, whether you bought it online or over the phone, the product can be returned for a full refund within 21 days of delivery as long as it's still in its original, unopened anti static (a silver coloured bag or pink bubble material) packaging. Please follow the returns policy above.
We sincerely apologise if your product develops a fault within its warranty period, and if the fault occurs within 30 days of purchase (or delivery) we will always offer you an exchange or refund. However, in all cases we do reserve the right to inspect the product and verify the fault, if you would like to discuss this further please call us on 0808 196 2772, alternatively follow the returns policy above.
We want you to be absolutely satisfied with your Blackmore IT product and would recommend that, where practicable, you unpack and check it for any transit damage as soon as your product arrives. If you receive a damaged product please call us as soon as possible on 0808 196 2772 to inform us about this issue.
We will then arrange an exchange or refund as soon as possible, once the return has been processed as per the above returns policy.
Our Return to Base (RTB) warranties mean if the item doesn't work on delivery we cover all costs of getting a replacement sent out immediately. However, if the item works on delivery but within 6 months breaks then we ask you to send it back to us for repair or replacement.