Corsair CX650 650W 80 PLUS Bronze ATX PSU vs Corsair RMx Series RM1000x Fully Modular Power Supply

Researched, not hands-on tested.How we review ›

all judged against power supplies at a similar price

The Corsair RMx Series RM1000x Fully Modular Power Supply scores 7.7/10 overall, ahead of the Corsair CX650 650W 80 PLUS Bronze ATX PSU at 5.3/10.

The Corsair RMx Series RM1000x Fully Modular Power Supply leads on quality and protections, efficiency, cabling and connectors, noise and warranty.

The biggest difference is cabling and connectors, where the Corsair RMx Series RM1000x Fully Modular Power Supply scores 8/10 to the Corsair CX650 650W 80 PLUS Bronze ATX PSU's 4/10.

Corsair CX650 650W 80 PLUS Bronze ATX PSU

5.3/10verdict: good, not the best

The Corsair CX650 is a 650W ATX power supply with fixed cabling and 80 PLUS Bronze efficiency. It suits a single-GPU desktop or a small server with a few drives. It is less suited to builds that need modular cabling, a native 12V-2x6 cable or high efficiency.

Typically about £44.99 in the UK when we researched itSearch Amazon UK

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Corsair RMx Series RM1000x Fully Modular Power Supply

7.7/10verdict: buy

The Corsair RM1000x suits builders putting a high-power graphics card into a new ATX system. It also fits drive-heavy workstations and homelab machines that need many SATA connectors. It is a fully modular 1000W unit with a 10-year warranty and a native 12V-2x6 connector.

Typically about £130 in the UK when we researched itSearch Amazon UK

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Scores, criterion by criterion

Criterion	Weight	Corsair CX650 650W 80 PLUS Bronze ATX PSU	Corsair RMx Series RM1000x Fully Modular Power Supply
Quality and protections	30%	6/10	7/10
Efficiency	20%	5/10	8/10
Cabling and connectors	20%	4/10	8/10
Noise	15%	5/10	6/10
Warranty	15%	6/10	10/10
Overall		5.3/10	7.7/10

Specifications

Spec	Corsair CX650 650W 80 PLUS Bronze ATX PSU	Corsair RMx Series RM1000x Fully Modular Power Supply
Rated output (W)	650 W continuous	1000W continuous
Efficiency rating (80 Plus or Cybenetics)	80 PLUS Bronze	Measured Cybenetics Platinum: 89-91% at 115V, 91-93% at 230V (Hardware Busters)
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x support	ATX (ATX12V v2.31; ATX 3.x not stated)	ATX, 160x150x86 mm (Corsair); 150x85x160 mm (Hardware Busters)
Modular cabling (fully, semi or non-modular)	No (non-modular)	Fully modular, Type-4 cables
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)	2 PCIe 8-pin (6+2) on one cable; 3 SATA on one cable; 2 PATA 4-pin; no 12V-2x6 or 12VHPWR	1x PCIe 12V-2x6 (12+4), 4x PCIe 8-pin (6+2), 2x EPS 8-pin, 12x SATA, 6x PATA
Fan size and zero-fan mode	120mm sleeve bearing, thermally controlled; zero-RPM mode not stated	1x 140mm fluid dynamic bearing fan with Zero RPM mode and manual override knob
Warranty (years)	5 years	10 years

Strengths and weaknesses

Corsair CX650 650W 80 PLUS Bronze ATX PSU

+ 5-year warranty
+ 12V ripple of 48.6 mV at full load, within the limit
+ Compact 125mm body
− Non-modular cabling
− No 12V-2x6 or 12VHPWR connector
− 80 PLUS Bronze efficiency only

Skip it if:

Buyers whose graphics card needs a native 12V-2x6 or 12VHPWR cable
Anyone wanting modular cabling for a tidy build
Builders with many SATA drives or high-efficiency needs for an always-on PC

Read the full Corsair CX650 650W 80 PLUS Bronze ATX PSU review ›

Corsair RMx Series RM1000x Fully Modular Power Supply

+ 10-year warranty
+ Native 12V-2x6 plus four PCIe 8-pin and 12 SATA
+ Platinum-level efficiency measured on 230V
− Light-load efficiency is modest, about 74% at 20W
− Some owners report scratchy fan noise near full speed
− Some owners say the fan runs at full speed at desktop

Skip it if:

Buyers building a low-power always-on box who want high efficiency at very light loads
Buyers who need an utterly silent system and are bothered by reports of fan noise
Buyers with a small chassis that cannot take a roughly 160 mm deep ATX unit

Read the full Corsair RMx Series RM1000x Fully Modular Power Supply review ›

More comparisons

Compare all power supplies · Best power supplies