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Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
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Description
be quiet! System Power 11 550W is ATX 3.1 compliant and PCIe 5.1 compatible, 5-year manufacturer's warrantySYSTEM POWER 11 550W Proven Reliability, Quiet Operation System Power 11 is the ATX 3. 1 PSU for value oriented PC builders that do not want to pass on reliability and quietness. Highlights ATX 3. 1 PSU with support for PCIe 5. 1 GPUs and GPUs with 6+2 pin connectors Temperature controlled 120mm quality fan reduces system noise Rock solid stability with a strong 12V rail Tight voltage regulation using DC to DC technology Up to one PCIe 5. 1 12V 2x6
SYSTEM POWER 11 550WProven Reliability, Quiet Operation System Power 11 is the ATX 3.1 PSU for value-oriented PC builders that do not want to pass on reliability and quietness.
Highlights
ATX 3.1 PSU with support for PCIe 5.1 GPUs and GPUs with 6+2 pin connectors
Temperature-controlled 120mm quality fan reduces system noise
Rock-solid stability with a strong 12V-rail
Tight voltage regulation using DC-to-DC technology
Up to one PCIe 5.1 12V-2x6 600W and up to 3 PCIe 6-2 connectors for high-end GPUs
Dependable operation to support powerful GPUs
Stand-by drain of less than 0.15 watts
80 PLUS Bronze efficiency (up to 90.0 %)
5-year manufacturer’s warranty
Product conception, design and quality control in Germany
General
Model
System Power 11 550 W
Continuous power (W)
550
Peak power (W)
No
Form factor
Version 3.1
Form factor EPS 12V
Version 2.92
Topology
Double forward + DC-DC
Digitally controlled
No
Voltage (Vac)
200 - 240
Frequency (Hz)
50
Input current (A)
4
Power factor at 100% load
>0.98
Modern standby
Yes
Power consumption in standby (W)
<0.1
Average life time (h / 25°C)
>100,000
Operating temperature up to (°C)
40
Efficiency
80 PLUS certification
Efficiency (%) at 230V, 2% load64.4 Bronze
Efficiency (%) at 230V, 10% load 84.4 Bronze
Efficiency (%) at 230V, 20% load 88.6 Bronze
Efficiency (%) at 230V, 50% load 89.7 Bronze
Efficiency (%) at 230V, 100% load 86.6 Bronze
Fan and cooling technology
Cybenetics Noise Rating
No
Fan
Silence-optimized be quiet! fan
Fan size (mm)
120
Bearing technology
Rifle
Motor technology
4-pole fan motor
Max. fan speed (rpm)
1800
dB(A) at 10% load
10.4
dB(A) at 20% load
10.8
dB(A) at 50% load
11.0
dB(A) at 100% load
24.2
Output
Multi-rail operation (12V rails)
No
12V single rail operation
Yes
Overclocking key
No
+3.3V (A)
20
+5V (A)
20
+12V1 (A)
45.83
+12V2 (A)
no
+12V3 (A)
No
+12V4 (A)
No
+12V5 (A)
No
+12V6 (A)
No
-12V (A)
0.3
+5Vsb (A)
3
Max. combined power 12V (W)
550
Max. combined power 12V-2x6 (W)
300
Max. combined power 3.3V + 5V (W)
120
Hold-up time at 100% load (ms)
16.86
Hold-up time at 80% load (ms)
20.92
Power good signal (ms)
100 - 150
Cables and connectors
Modular cables
No
Sleeved cables
P24
Flat cables
P4+4, P4, PCIe, drives
Maximum cable length (cm)
55
Cable length to motherboard (cm)
79
No. of cables
7
ATX-Motherboard (20+4-pin)
1
P4+4 (CPU)
1
P8 (CPU)
No
P4 (CPU)
1
12V-2x6 cables
1
PCI-e 6+2-pin (GPU)
2
PCI-e 6-pin (GPU)
No
SATA
5
PATA
1
FDD (Floppy)
No
Protection
OTP (over temperature protection)
Yes
OCP (over current protection)
Yes
OPP (over power protection)
Yes
SCP (short circuit protection)
yes
OVP (over Voltage protection)
Yes
UVP (under Voltage protection)
Yes
SIP (Surge & Inrush protection)
Yes
Safety certification
BSMI
No
CB
No
CCC
No
CE
Yes
cRUus
No
cTUVus
No
CU
Yes
FCC
No
RCM
No
TUV
Yes
UKCA
Yes
IRAM
No
Environmental directives
ErP
Yes
WEEE
Yes
RoHS
Yes
Triman
No
Scope of delivery
Thumb screws
No
Screws
Yes
Cable ties
Yes
Velcro cable ties
No
User manual languages
No
OCK slot bracket with switch / OCK jumper
No
SFX-to-ATX adapter bracket
No
Casing
Dimensions without cable (L x W x H), (mm)
86 x 150 x 140
Weight (kg)
1.92
Color
Black
Logistics data and RRP
Dimensions, package (L x W x H), (mm)
268 x 195 x 97
Gross weight, package (kg)
2.3
Pieces per packaging unit
6
Dimensions, shipping box (L x W x H), (mm)
556 x 311 x 218
Gross weight, shipping box (kg)
14.9
Service
Warranty (Years)
5
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 2404 reviews
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Product Reviews
★★★★★ 5
great taste and healthy
Flavor Name: Peach Mango, Size: Pack of 24 (8 Fl Oz)
taste good and a great smell i prefer this over a lot of energy drinks
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026
★★★★★ 5
GREAT GRAPE FLAVORED AND INCREASED ENERGY
Set name: Welch's Grape
I have tried the competitor’s grape flavored versions.
This is by far the best grape flavored energy drink.
It gives you the increased energy level you’re looking for without making you feel “fidgety.”
Highly recommend this energy drink for its effectiveness and flavor!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
★★★★★ 5
Green Apple is the best!
Set name: Warheads Sour Green Apple
Love these, I am subscribed for every two weeks, they last me one a day at work until the next shipment. Yay! Green sour apple is just the best. It’s slightly sour and refreshing. I work graveyard and stay awake all night with one of these. Super effective, great value for the money since I’m getting them cheaper this way than buying one a day at the convenience store next to my house. They’re sugar free but use sucralose, which is wannabe sugar but still, I’d say better for me (pre-diabetic) than real sugar.
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Reviewed in the United States on April 19, 2026
★★★★★ 5
Red Berry Drink
Set name: Sour Patch Kids Redberry
I drink one of these red cans when I get to the shop in the mornin. The taste reminnd me of the candy my kids liked when they were small. It has a sour kick at first but a sweet taste comes next in my mouth. I feel awake after I finish the can. My focus stays sharp while I work on the mashines for a few hours. I do not feel jitters in my hands or my chest like I do with some coffee. The liquid has no color which is fine with me because it does not stain my teath. I keep the pack in the small fridge in the garage to keep them cold. It is a good choice for days when I have a lot of heavy labor to do. My brother tried one and he thought the flavor was tart but I think it is right. I do not feel a crash when the afternoon comes. It is a way to get energy for my shift. I like that the cans are tall and hold much to last a while. My wife says I look alert when I use them before our walk.
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Reviewed in the United States on February 19, 2026
★★★★★ 5
I’ll buy it again.
Set name: Warheads Sour Green Apple
Ghost is very good. Especially comparing it to other energy drinks that literally tingle your whole body if you drink it too quickly. When I’m looking for energy drinks I really want more focus and mental energy over simple caffeine high and energy. This does give me both. In a good way. It has been very effective in what it says it does. Definitely value for the money over buying it at the gas stations one by one. Buying it in bulk definitely cuts the cost down. Energy levels peak very well without a crash at the end. The ingredients seems to be very good because my body doesn’t feel heavy afterwards.
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Reviewed in the United States on April 18, 2026