MANUAL | QUICK START GUIDE
CORSAIR CX ATX 3.1 SERIES
LOW NOISE POWER SUPPLIES
In this Guide
Congratulations on the purchase of your new CORSAIR CX ATX 3.1 Series Power Supply!
The CX ATX 3.1 Series Power Supply is built for next-gen gaming with ATX 3.1 certification. It has a compact 125mm length for easy installation while being tuned for quiet operation. It's available in black or white with a striking Y-pattern fan grill for excellent airflow.
SAFETY AND PROTECTION
OVER-VOLTAGE PROTECTION (OVP)
Over-voltage protection for the 12V, 5V, and 3.3V DC outputs is required to comply with the ATX specification. OVP shuts down the PSU in the event that the DC outputs exceed a set level, determined by the PSU manufacturer.
OVER-CURRENT PROTECTION (OCP)
OCP is featured on the 3.3V, 5V, and 12V rails. OCP ensures that the output of the DC voltage rails remains within safe operating limits.
OVER-TEMPERATURE PROTECTION (OTP)
OTP ensures that the PSU will shut down when the internal temperature reaches a set point. This is usually as a result of internal current overloading or a fan failure.
SHORT-CIRCUIT PROTECTION (SCP)
A short-circuit is defined as any output impedance of less than 0.1 ohms. Amongst other things, SCP ensures that the PSU shuts down should the 3.3V, 5V, and 12V rails short to any other rail, or to ground. It also ensures that no damage should occur to the unit, or your PC’s components in the event of a short.
OVER-POWER PROTECTION (OPP)
Over-power protection shuts off the PSU when the power drawn is between 115% and 135% of the rated power.
NO-LOAD OPERATION (NLO)
NLO ensures that the PSU can operate safely and remain stable even when little or no load is applied to its DC outputs.
SURGE AND INRUSH PROTECTION (SIP)
SIP protects the PSU and connected components against sudden voltage surges and limits excessive inrush current when the PSU is first switched on.
UNDER-VOLTAGE PROTECTION (UVP)
Under-voltage protection for the 12V, 5V and 3.3V DC outputs is required to comply with the ATX specification. UVP shuts down the PSU in the event that the DC outputs drop below a set level.
INCLUDED CABLES
1x ATX Motherboard (24-pin) Cable
600mm (± 10mm)
1x ATX12V / EPS12V (4+4-pin) Cable
(with CX ATX 3.1 550W)
600mm (± 10mm)
1x Dual ATX12V / EPS12V (4+4-pin) Cable
(with CX ATX 3.1 650W & 750W)
600mm (± 10mm)
1x Dual 8-pin PCIe (6+2-pin) Cable
600mm (± 10mm)
1x 8-pin PCIe (6+2-pin) Cable
(with CX ATX 3.1 750W)
600mm (± 10mm)
1x 450W 12V-2x6 (12+4-pin) Cable
(with CX ATX 3.1 650W)
600mm (± 10mm)
1x 600W 12V-2x6 (12+4-pin) Cable
(with CX ATX 3.1 750W)
600mm (± 10mm)
1x 3 SATA Cable
600mm (± 10mm)
1x 2 PATA Cable
500mm (± 10mm)
CX550 ATX 3.1
DIMENSIONS
| Length | 125mm |
| Width | 150mm |
| Height | 86mm |
| CORSAIR CX550 ATX 3.1 POWER TABLE | MAX LOAD | MAX OUTPUT | ||||
| MODEL | RPS0258 | +3.3V | 20A | 100W | ||
| PART NO. |
75-007253 (Black) 75-007256 (White)
|
+5V | 20A | |||
| AC INPUT RATING | 100V–240V a.c. |
200V–240V a.c. (Only for Korea & India)
|
+12V | 45.8A | 550W | |
| -12V | 0.3A | 3.6W | ||||
| INPUT CURRENT | 10A–5A | 5A | +5Vsb | 3A | 15W | |
| FREQUENCY | 47Hz–63Hz | |||||
| TOTAL POWER: 550W | ||||||
EFFICIENCY AND NOISE CHART
CX650 ATX 3.1
DIMENSIONS
| Length | 125mm |
| Width | 150mm |
| Height | 86mm |
| CORSAIR CX650 ATX 3.1 POWER TABLE | MAX LOAD | MAX OUTPUT | ||||
| MODEL | RPS0259 | +3.3V | 20A | 100W | ||
| PART NO. |
75-007254 (Black) 75-007257 (White) |
+5V | 20A | |||
| AC INPUT RATING | 100V–240V a.c. | 200V–240V a.c. (Only for Korea & India) |
+12V | 54A | 650W | |
| -12V | 0.3A | 3.6W | ||||
| INPUT CURRENT | 10A–5A | 5A | +5Vsb | 3A | 15W | |
| FREQUENCY | 47Hz–63Hz | |||||
| TOTAL POWER: 650W | ||||||
EFFICIENCY AND NOISE CHART
CX750 ATX 3.1
DIMENSIONS
| Length | 125mm |
| Width | 150mm |
| Height | 86mm |
| CORSAIR CX750 ATX 3.1 POWER TABLE | MAX LOAD | MAX OUTPUT | ||||
| MODEL | RPS0260 | +3.3V | 20A | 120W | ||
| PART NO. |
75-007255 (Black) 75-007258 (White) |
+5V | 20A | |||
| AC INPUT RATING | 100V–240V a.c. | 200V–240V a.c. (Only for Korea & India) |
+12V | 62.5A | 750W | |
| -12V | 0.3A | 3.6W | ||||
| INPUT CURRENT | 10A–5A | 5A | +5Vsb | 3A | 15W | |
| FREQUENCY | 47Hz–63Hz | |||||
| TOTAL POWER: 750W | ||||||
EFFICIENCY AND NOISE CHART
INSTALLING YOUR CX ATX 3.1 POWER SUPPLY
STEP 1: REMOVING YOUR EXISTING POWER SUPPLY
If you are building a new system, skip to Step 2.
- Disconnect the AC power cord from your wall outlet or UPS and from the existing power supply.
- Disconnect all the power cables from your video card, motherboard and all other peripherals.
- Follow the directions in your chassis manual and uninstall your existing PSU.
- Proceed to Step 2.
STEP 2: INSTALLING YOUR CX ATX 3.1 POWER SUPPLY
- Make sure the power supply’s AC power cable is not connected.
- Follow the directions in your chassis manual and install the power supply with the screws provided.
- Connect the 24-pin (ATX12V) cable to the motherboard.
- Connect the 4+4-pin +12V (EPS12V) cable to the motherboard's EPS socket:
If your motherboard has an 8-pin EPS socket, connect the 4+4-pin EPS12V cable directly to your motherboard.
If your motherboard has a 4-pin EPS socket, detach the 4-pin from the 4+4-pin EPS12V cable, and then plug this 4-pin cable directly to your motherboard.
Some motherboards will require a mix of 8+4 pins, use as many EPS12V connectors as necessary and do not mistake them for PCIe cables.
- Connect the PATA cable to any peripherals requiring a 4-pin connector;
Connect the 4-pin end to the device.
- Connect the SATA cable to your SATA SSD or hard drives.
Connect the SATA connector to the device.
- Connect the PCIe cables to the power connector of your PCIe devices;
Connect the 8-pin (6+2-pin) connector to your device. If your device uses a 6-pin connector, detach the 2-pin segment from the 6+2 connector and connect only the 6-pin portion.
GPUs with 12-pin (2x6-pin) power sockets
- Connect the 12V-2x6 cable to your GPU:
Dual-tone 12V-2x6 Connector
The CX650 and CX750 includes a 12V-2x6 GPU power cable with dual-tone connectors. This dual-tone design features grey tips on the ends of the cable to give you visual confirmation the cable is fully inserted. For proper installation of the cable, insert each end into the PSU/GPU until you feel it click into the retention mechanism, and inspect each end of the cable to make sure there is no grey portion of the connectors visible. If you can still see any grey on the end of the cable after you've connected both ends, remove the cable and reinsert it until there is no grey visible on either end of the connection.
CONNECTING TO POWER
Connect the AC power cord to the PSU and turn it on by pushing the switch to the ON position (marked with “I”).
WARRANTY
CORSAIR CX ATX 3.1 Series PSUs have a 5-year warranty.
LEGAL
© 2026 CORSAIR MEMORY, Inc. All rights reserved. CORSAIR and the sails logo are registered trademarks of CORSAIR in the United States and/or other countries. All other trademarks are the property of their respective owners. Product may vary slightly from those pictured.