Is the primary motherboard connector 24-pin or 20 + 4 pin? I have a much older ATX board (2003-2004) that I'm trying to find a power supply for.

The primary motherboard connector is 20 + 4 pin.

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Main image of CORSAIR RMx Series RM550x CP-9020177-NA 550 W ATX12V / EPS12V 80 PLUS GOLD Certified Full Modular Power Supply

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CORSAIR RMx Series RM550x CP-9020177-NA 550 W ATX12V / EPS12V 80 PLUS GOLD Certified Full Modular Power Supply

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Options: ATX 80+ Gold (550W)

ATX 80+ Gold (1000W)
ATX 80+ Gold (550W)
ATX 80+ Gold (650W)

ATX12V / EPS12V
Full Modular
80 PLUS GOLD Certified
100 - 240 V 47 - 63 Hz
+3.3V@25A, +5V@25A, [email protected], [email protected], +5VSB@3A

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MAIN OVERVIEW FEATURES: Number of Fans: 1Modular: YesOutput Power: 550 WForm Factor: InternalHeight: 5.91" (150 mm)Width: 3.39" (86 mm)Depth: 6.30" (160 mm)Package Contents: RMx Series RM550x 80 PLUS Gold Fully Modular ATX Power Supply Power Cord Mounting Screws Cable Ties Corsair Case Badge User Manual Environmentally Friendly: YesEnvironmental Certification: 80 Plus GoldLimited Warranty: 10 Year

General
Brand	CORSAIR
Series	RMx Series RM550x
Model	CP-9020177-NA

Details
Type	ATX12V / EPS12V
Maximum Power	550 W
Fans	1 x 140mm Low Noise Rifle Bearing Fan
Main Connector	20+4Pin
+12V Rails	Single
PCI-Express Connector	2 x 6+2-Pin
SATA Power Connector	6
Max PSU Length	160 mm
Modular	Full Modular
Energy-Efficient	80 PLUS GOLD Certified
Over Voltage Protection	Yes
Input Voltage	100 - 240 V
Input Frequency Range	47 - 63 Hz
Input Current	10A - 5A
Output	+3.3V@25A, +5V@25A, [email protected], [email protected], +5VSB@3A
MTBF	100,000 hours
Connectors	1 x ATX 24-PIN (20+4) 1 x EPS/ATX12V 8-PIN (4+4) 2 x PCIe 8-PIN (6+2) 6 x SATA (3 SATA) 4 x PERIPHERAL (4-PIN) 1 x FLOPPY DRIVE ADAPTER (4-PIN)

Features
Features	80 PLUS Gold Certified: High efficiency operation for lower power consumption, less noise and cooler temperatures. Tuned for Low Noise Operation: A specially set fan curve ensures that, even at full load, fan noise is kept to a minimum. Zero RPM Fan Mode: At low and medium loads the cooling fan switches off entirely for near-silent operation. 100% All Japanese 105°C Capacitors: Premium internal components ensure unwavering power delivery and long-term reliability. Fully Modular Cables: Only connect the cables your system needs, making clean and tidy builds easier. Compact Size: A 160mm-long casing ensures an easy fit in almost all modern enthusiast PC cases. Ten-Year Warranty: Your guarantee of reliable operation that will last across several system builds.

Dimension & Weight
Dimensions	3.39" x 5.91" x 6.30"
Weight	3.36 lbs.

Package
Package Content	RMx Series ATX Power Supply Power cord Mounting screws Cable ties Corsair case badge User manual

Additional Information
First Listed on Newegg	September 11, 2026

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CORSAIR RMx Series RM550x CP-9020177-NA 550 W ATX12V / EPS12V 80 PLUS GOLD Certified Full Modular Power Supply

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Item#: 9SIC9BAM690561

Meet Your Seller

CORSAIR RMx Series RM550x CP-9020177-NA 550 W ATX12V / EPS12V 80 PLUS GOLD Certified Full Modular Power Supply

Learn more about the Corsair CP-9020177-NA

Customer Reviews of the Corsair CP-9020177-NA

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info