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Compare CORSAIR RM850x Shift 2025 vs Cooler Master MasterWatt 550W

CORSAIR RM850x Shift 2025 and Cooler Master MasterWatt 550W are both power supplies with the same Molex Connectors (4). The main differences are in Wattage, Modular, PCI-Express 16 Pin 12VHPWR Connectors and PCI-Express 6+2 Pin Connectors.

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CORSAIR RM850x Shift 2025

Cooler Master MasterWatt 550W

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Brand

Corsair

Brand

Cooler Master

Model

CP-9020299-NA
CP-9020299-EU
CP-9020299-UK
CP-9020299-AU

Model

MPX-5501-AMAAB-US
MPX-5501-AMAAB-UK
MPX-5501-AMAAB-AU
MPX-5501-AMAAB-EU

Release Date

📅 November 2025

Release Date

📅 September 2017

* First availability for purchase, it may not correspond to the actual market launch date.

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Compatible PC parts

Graphics Cards ► Cases ►

Compatible PC parts

Graphics Cards ► Cases ►

Wattage

850 W

Wattage

550 W

Type

ATX

Type

ATX

Modular

Full Shifted

Modular

Semi

Efficiency

-

Efficiency

80+ Bronze

Output

-

Output

+3.3V@20A, +5V@20A, +12@45.8A, -12V@0.3A, +5VSB@3A

PCI-Express 16 Pin 12VHPWR Connectors

1

PCI-Express 16 Pin 12VHPWR Connectors

0

PCI-Express 12 Pin Connectors

0

PCI-Express 12 Pin Connectors

0

PCI-Express 6+2 Pin Connectors

4

PCI-Express 6+2 Pin Connectors

2

PCI-Express 6 Pin Connectors

0

PCI-Express 6 Pin Connectors

0

EPS Connectors

2

EPS Connectors

1

SATA Connectors

9

SATA Connectors

6

Molex Connectors

4

Molex Connectors

4

Length

160 mm

Length

140 mm

-

Options (2)

	650W $54.99
	750W $49.99

Comparison and key differences summary

Reasons to buy the CORSAIR RM850x Shift 2025:

Newer Product, it was released around 8 years later
+300 Watts available
Fully modular power supply
+2 PCI-Express 6+2 Pin connectors available
+1 EPS connectors available
+3 SATA connectors available

Reasons to buy the Cooler Master MasterWatt 550W:

55% cheaper, you can save $82.86

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