CX550
The Corsair CX550 is a 550W ATX power supply rated 80+ Bronze, non-modular. Independent lab testing puts it at A for noise, averaging 23.7 dB(A) across the load range, meaning quiet under load. Full specs, quality score and current prices are below.
Prices update regularly and may differ at the retailer. This page contains affiliate links.
Quality score
How we score →A power supply has no performance benchmark: every 550W unit delivers 550W. This scores how well built and how liveable the CX550 is, out of 100, from six published factors.
Better always scores higher, but the steps are uneven on purpose: Bronze to Gold is worth 11 of the 25 efficiency points, Gold to Titanium only 6. A factor we hold no value for scores zero rather than being skipped, so a unit we know little about never outranks a fully specified one. That does mean a zero can mean either poor or unknown, which is what the confidence figure above is for. Physical size scores nothing: ATX is a fit decision, not a quality one.
Measured in the lab
Everything else on this page is a specification the manufacturer published. These figures were measured from the CX550 itself by Cybenetics, an independent test lab.
- Average efficiency
- 85.7%Averaged across the full load range
- Average noise
- 23.7 dB(A)Cybenetics grade A, averaged across the load range
- Zero-RPM mode
- NoThe fan runs at every load
- Fan bearing
- Fluid dynamicWhat the fan spins on, and how long it lasts
Each figure is an average over more than 1,450 load combinations, which is not the same measurement as the 80+ Bronze badge on the box. That badge certifies the unit at a handful of fixed load points; this covers the whole range, including the light loads a desktop spends most of its time at. Lab figures exist for roughly a fifth of the units we track, so their absence on another page means that unit has not been through this lab, not that it did badly.
Specifications
Output & Rating
- Continuous power
- 550 W
- Efficiency
- 80+ Bronze
- ATX 12V standard
- ATX 2.31
- Price per watt
- $0.136/W
- MSRP
- $59.99
Connectors
- Motherboard
- 24-pin
- CPU (EPS)
- 1 (4+4)
- PCIe
- 2 (6+2)
- 12V-2x6 / 12VHPWR
- —
- SATA
- 3
- Molex (4-pin)
- 2
Physical
- Form factor
- ATX
- Depth
- 125 mm
- Fan size
- 120 mm
- Modularity
- Non-modular
- Cable colour
- black
- Colour
- black
- RGB
- No
Platform
- Built by
- Great Wall
Electrical & Warranty
- Input voltage
- 100-240 V
- Input frequency
- 47-63 Hz
- Warranty
- 5 years
- Part number
- CP-9020277-NA
Compare the CX550 against every other unit on the power supply comparison table. Not sure how much wattage you need? The power supply guide works through the sizing.
Where to buy the CX550
Every in-stock retailer offer we track, cheapest first.
| Retailer | Availability | Price | Buy |
|---|---|---|---|
| Amazon | In stock | $74.99 |  |
The CX550 starts from $74.99 across 1 retailer, which works out at $0.136/W. Prices update daily from live stock.
What the CX550 can power
Compare all GPUs →The graphics cards this 550W unit meets the system requirement for, ranked fastest first at 1080p, with the margin left over. The resolution follows the wattage, because a unit this size is bought for a card that will be run at 1080p. Headroom is measured against the card maker’s own whole-system recommendation, so 0 W means it meets that recommendation exactly rather than falling short.
| Graphics card | Card draw | PSU advised | Headroom |
|---|---|---|---|
| Radeon RX 9060 XT 16 GB AMD | 160 W | 450 W | +100 W |
| Radeon RX 9060 XT 8 GB AMD | 150 W | 450 W | +100 W |
| GeForce RTX 4060 Ti 8GB Nvidia | 160 W | 550 W | +0 W |
| GeForce RTX 5060 Nvidia | 145 W | 550 W | +0 W |
| GeForce RTX 4060 Nvidia | 115 W | 550 W | +0 W |
| Radeon RX 7600 AMD | 165 W | 550 W | +0 W |
| GeForce RTX 5050 Nvidia | 130 W | 550 W | +0 W |
| Intel Arc B570 Intel | 150 W | 450 W | +100 W |
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