Seasonic Connect 750 W PSU review - Certification and efficiency

Name: Seasonic Connect 750 W PSU review
Brand: Seasonic Connect 750 W PSU review

by Krzysztof Hukalowicz on: 06/12/2020 01:56 PM [ ] 22 comment(s)

Energy efficiency certification

Seasonic markets the Connect series as their 80 Plus Gold power supplies. Certification is performed by an organization called 80 PLUS. But what does this mean “on paper”? It’s a program that was introduced in 2004 and is intended to promote efficient energy use in computer power supply units (PSUs). Only products that offer more than 80% efficiency at 20, 50, and 100% load, and a power factor of 0.9 or more, are eligible. This means that the PSU will waste 20% or less electric energy as heat, reducing power consumption and bills as compared with less efficient designs.

80 Plus test type	115 V internal non-redundant					230 V EU internal non-redundant
Percentage of rated load	10%	20%	50%	100%	10%		20%	50%	100%
80 Plus		80%	80%	80%			82%	85%	82%
80 Plus Bronze		82%	85%	82%			85%	88%	85%
80 Plus Silver		85%	88%	85%			87%	90%	87%
80 Plus Gold		87%	90%	87%			90%	92%	89%
80 Plus Platinum		90%	92%	89%			92%	94%	90%
80 Plus Titanium	90%	92%	94%	90%	90%		94%	96%	94%

As you can see above, there are 80 Plus, Bronze, Silver, Gold (these three are from 2008), Platinum (2009), and Titanium (2012) certificates. Nowadays, most computers with a single GPU don’t need more than a 600-650 W PSU, as power consumption has dropped over the years. The PSU tested today is the most efficient at 50% load (375 W), but the differences above and below this threshold are not significant. You don’t need to keep it exactly at half load, but for better noise performance, longevity, etc., it’s best to stay below the maximum wattage. The reviewed sample is 80 PLUS Gold certified – up to ~90% efficiency @ 115 V (at 20~100% loads) – and has active PFC with a power factor of up to 0.99. It consumes < 0.3 W in its off-mode, complying with the ERP standard. If you want to check the Seasonic CONNECT’s measurements taken by the 80 Plus organization, you can have a look at them here.

Technical Specs below:


Max. DC Output	750 W
PFC	Active PFC
Efficiency	80 PLUS Gold
Modular	Yes, Flat Black cables
Operating Temperature	0–40 °C, 80% from 40 to 50°C
MTBF @ 25 °C, excl. fan	150,000 hours
Protections	OPP, OVP, UVP, OCP, OTP, SCP
Cooling	135 mm Fluid Dynamic Bearing Fan (HA13525H12F-Z)
Semi-passive operation	Yes (selectable) – Hybrid Mode
Dimensions (W x H x D)	PSU: 140 mm (L) x 150 mm (W) x 86 mm (H)
Dimensions (W x H x D)	Connect: 328 mm (L) x 63 mm (W) x 20 mm (H)
Weight	1.61 kg (3.55 lb)
Compliance	ATX12V v2.31, EPS 2.92
Warranty	10 years

Below, you can find a list of the supplied modular cables:


Description	Cable Count	Connector Count (Total)
ATX connector 20+4 pin (210 mm)	1	1
4+4 pin EPS12V (240 mm)	2	2
6+2 pin PCIe (280 mm)	2	2
6+2 pin PCIe (320 mm)	2	2
SATA (300 mm+70 mm+70 mm+70 mm)	1	4
SATA (200 mm+40 mm)	1	2
SATA (120 mm+110 mm)	1	2
4-pin Molex (450 mm+120 mm+120 mm)	1	3
4-pin Molex to SATA 3.3V Adapter (150 mm+150 mm)	1	2

The street price is 169.99 USD. Let’s see if it’s worth it. Next page, please.

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Today we’re putting the new Seasonic Vertex GX-1000W power supply on our test bench. The company is mainly known for its PSUs (like the Prime series, which we checked, for example, the TX-1300) and the chassis (like the Arch Q503 or Syncro Q704). The Vertex series is a new one from Seasonic that was launched in September 2022, but with the availability specified for January 2023. It consists of 80 Plus Platinum or Gold efficiency and has the following wattage variants: 1200 W, 1000 W (which we’re checking in an 80 Plus version), 850 W, and 750 W.

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Seasonic Syncro Q704 chassis + Connect PSU review
Seasonic company is known for its great power supplies, including the Focus (available both in ATX and factor), Prime (with the 80 Plus certificate up to Titanium), or Connect series. Speaking of the last one, they’ve gone further by introducing a chassis containing this piece of hardware – it’s a Seasonic SYNCRO Q704. But that’s not all – according to the marketing information, it really fits together, literally and figuratively.