Corsair CX550M 2021 vs RM850x Shift 2025 Power Supply Comparison

Corsair CX550M 2021 and CORSAIR RM850x Shift 2025 are both power supplies with the same PCI-Express 6+2 Pin Connectors (4) and Molex Connectors (4). The main differences are in Wattage, Modular, PCI-Express 16 Pin 12VHPWR Connectors and EPS Connectors.

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Corsair CX550M 2021	CORSAIR RM850x Shift 2025
Prices (Change region) Out of Stock Free shipping $69.99 Out of Stock $69.99 Out of Stock + $3.99 Shipping $76.95 Out of Stock Free shipping $88.37 Show 1 more offers	Prices (Change region) In Stock $149.99 Last updated 10 minutes ago. In Stock Free shipping $149.99 Out of Stock $161.99 In Stock Free shipping $169.99 Show 1 more offers
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Brand Corsair	Brand Corsair
Model CP-9020220-NA CP-9020220-EU CP-9020220-UK CP-9020220-AU	Model CP-9020299-NA CP-9020299-EU CP-9020299-UK CP-9020299-AU
Release Date -	Release Date 📅 November 2025
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews Add a product review
Price history View Details ►	Price history View Details ►
Compatible PC parts Graphics Cards ► Cases ►	Compatible PC parts Graphics Cards ► Cases ►
Wattage 550 W	Wattage 850 W
Type ATX	Type ATX
Modular Semi	Modular Full Shifted
Efficiency 80+ Bronze	Efficiency -
PCI-Express 16 Pin 12VHPWR Connectors 0	PCI-Express 16 Pin 12VHPWR Connectors 1
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 4
PCI-Express 6 Pin Connectors 0	PCI-Express 6 Pin Connectors 0
EPS Connectors 1	EPS Connectors 2
SATA Connectors 6	SATA Connectors 9
Molex Connectors 4	Molex Connectors 4
Length 140 mm	Length 160 mm