Corsair CX650 650W 80 PLUS Bronze ATX PSU vs Seasonic FOCUS GX-750 ATX 3.1

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

all judged against power supplies at a similar price

The Seasonic FOCUS GX-750 ATX 3.1 scores 7.3/10 overall, ahead of the Corsair CX650 650W 80 PLUS Bronze ATX PSU at 5.3/10.

The Seasonic FOCUS GX-750 ATX 3.1 leads on quality and protections, efficiency, cabling and connectors, noise and warranty.

The biggest difference is warranty, where the Seasonic FOCUS GX-750 ATX 3.1 scores 10/10 to the Corsair CX650 650W 80 PLUS Bronze ATX PSU's 6/10.

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

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Seasonic FOCUS GX-750 ATX 3.1

7.3/10verdict: good, not the best

The Seasonic FOCUS GX-750 ATX 3.1 suits builders who want a fully modular 750 W unit with a modern GPU power connector. It fits compact ATX cases thanks to its 140 mm depth and backs that with a 10-year warranty. It is best for a single-graphics-card desktop or an always-on machine where low standby draw matters.

Typically about £119.99 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	Seasonic FOCUS GX-750 ATX 3.1
Quality and protections	30%	6/10	7/10
Efficiency	20%	5/10	7/10
Cabling and connectors	20%	4/10	7/10
Noise	15%	5/10	6/10
Warranty	15%	6/10	10/10
Overall		5.3/10	7.3/10

Specifications

Spec	Corsair CX650 650W 80 PLUS Bronze ATX PSU	Seasonic FOCUS GX-750 ATX 3.1
Rated output (W)	650 W continuous	750 W
Efficiency rating (80 Plus or Cybenetics)	80 PLUS Bronze	80 PLUS Gold; Cybenetics Platinum listed on v5 page
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x support	ATX (ATX12V v2.31; ATX 3.x not stated)	ATX/EPS, 140 mm depth
Modular cabling (fully, semi or non-modular)	No (non-modular)	Fully modular
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	2× EPS, 2× PCIe 6+2-pin, 1× PCIe 12+4-pin (600 W), 8× SATA on 2 cables, 3× Molex on 1 cable (v4 model); native 12V-2×6 cable (v5)
Fan size and zero-fan mode	120mm sleeve bearing, thermally controlled; zero-RPM mode not stated	135 mm fluid dynamic bearing, Digital Hybrid Fan Control
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 ›

Seasonic FOCUS GX-750 ATX 3.1

+ Ten-year warranty
+ Fully modular with 12+4-pin or 12V-2×6 cable
+ Standby draw measured under 0.06 W
− Only two PCIe 6+2-pin connectors
− One owner found it noisy in normal fan mode
− Connector details differ between v4 and v5 revisions

Skip it if:

Builders planning several graphics cards that each need PCIe 8-pin cables
Buyers who want the quietest possible unit in normal fan mode

Read the full Seasonic FOCUS GX-750 ATX 3.1 review ›

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