Seasonic Focus Plus Platinum 750 PSU Review

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Seasonic Focus Plus Platinum 750 PSU Review

Seasonic Focus Plus Platinum 750 PSU Review

Seasonic released a ton of new power supplies last year, and we’re still trying to get them all tested. Its Focus Plus Platinum series sits atop the Focus line-up and features four members with capacities ranging from 550W to 850W. They all boast 80 PLUS Platinum and ETA-A efficiency certifications, employ fully modular cabling, and are backed by a 10-year warranty. Moreover, the Focus Plus Platinum PSUs sport super-compact dimensions, with even the flagship 850W model measuring 140mm deep.

It is nice to see PSUs built with high power density and quiet operation in mind. Usually, small enclosures and lots of capacity necessitate faster fan speeds, resulting in more noise. Thanks to the Focus Platinum family’s high efficiency levels and smart layout, though, there is no need for increased airflow. Under normal operating conditions, these PSUs utilize relaxed fan profiles.

Seasonic Focus Plus Platinum 750 PSU Review

It’s the second-strongest Focus Plus Platinum model, capable of supporting a potent gaming PC with a pair of high-end graphics cards. Thanks to its two EPS cables, it also works with workstation-oriented motherboards that need more power for their CPUs.

Available for just £124.99 when this review was written, the SSR-750PX looks like a solid value; the competition is going to have a tough time matching it. Somehow, Seasonic is able to keep its price down without negatively affecting performance or build quality. This manufacturer clearly prefers selling Focus-branded PSUs on its own rather than offering the platform to other companies, so it doesn’t have a problem managing its competitive position.

Specifications:

Manufacturer (OEM)Seasonic
Max. DC Output750W
Efficiency80 PLUS Platinum, ETA-A (88-91%)
NoiseLAMBDA-A+ (15-20 dB[A])
Modular✓ (Fully)
Intel C6/C7 Power State Support
Operating Temperature (Continuous Full Load)0 – 50°C
Over Voltage Protection
Under Voltage Protection
Over Power Protection
Over Current (+12V) Protection
Over Temperature Protection
Short Circuit Protection
Surge Protection
Inrush Current Protection
Fan Failure Protection
No Load Operation
Cooling120mm Fluid Dynamic Bearing Fan (HA1225M12F-Z)
Semi-Passive Operation✓ (selectable)
Dimensions (WxHxD)152 x 86 x 142mm
Weight1.63 kg (3.59 lb)
Form FactorATX12V v2.4, EPS 2.92
Warranty10 Years

The PSU offers low overall noise, earning a LAMBDA-A+ certification from Cybenetics. Strangely, the 650W Focus Plus Platinum only reaches the LAMBDA-A- level since its acoustic output exceeds 25 dB(A). Either its fan control circuit is badly tuned or the SSR-750PX simply benefits from a more relaxed fan profile.

All of the other specifications are top-notch. Again, it’s amazing that Seasonic can deliver such strong performance in a compact footprint.

Power Specifications:

Rail3.3V5V12V5VSB-12V
Max. PowerAmps20206230.3
Watts100744153.6
Total Max. Power (W)750

A single +12V rail serves up 62A maximum current output. The minor rails have sufficient capacity to satisfy the demands of modern PCs, while the 5VSB rail can deliver up to 3A on paper, and double that in real-world testing.

Cables & Connectors:

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600mm)1118-22AWGYes
4+4 pin EPS12V (650mm)2218AWGYes
6+2 pin PCIe (680mm+80mm) 2418AWGYes
SATA (450mm+110mm+110mm+110mm)2818AWGNo
Four-pin Molex (450mm+120mm+120mm)1318AWGNo
FDD Adapter (+105mm)1122AWGNo
AC Power Cord (1370mm) – C13 coupler1118AWG

Seasonic equips this PSU with lots of cables, including two EPS, four PCIe, and eight SATA connectors. Some folks might want a few more four-pin Molex connectors. But as long as you keep power consumption low on the ones Seasonic gives you, splitters are a viable option for extra devices. There is also a Berg adapter provided, in case you need it.

In order to offer top-notch ripple suppression, the main ATX cable, along with the EPS and PCIe ones, use in-cable capacitors. Still, we’re not huge fans of in-cable caps because they make cables bulky and difficult to route.

Seasonic’s 750W Focus Plus Platinum PSU turns heads at its current price, no doubt about it. We don’t know how the company managed to hit such an attractive value point while maintaining strong performance, excellent build quality, and a 10-year warranty. Its SSR-750PX is the best 750W PSU you can buy in the $100 to $130 range, and it doesn’t surprise us that Seasonic is trying hard to satisfy the heavy demand for its newest platforms, especially the Focus.

In the past, Seasonic’s engineers played it safe with aggressive fan profiles for increased airflow. As a result, many of its previous-generation PSUs were fairly noisy. But with the fresh Prime and Focus models, they thankfully took a different approach. The high-efficiency Focus models feature semi-passive modes and loose fan profiles, even under tough operating conditions. It is nice to see key OEMs like Seasonic realizing that performance and reliability should go along with mild acoustics.

The SSR-750PX offers great load regulation, high efficiency, and amazing ripple suppression. On top of that, it is compact and comes with a large number of modular cables, including two EPS and four PCIe connectors. We also like that Seasonic’s semi-passive mode can be deactivated, allowing the PSU to be installed with its fan facing downwards. In our opinion, all manufacturers should provide the ability to deactivate their semi-passive fans. Because this costs a bit more, many of them choose not to give you that option.

Seasonic’s build quality is high. In addition to fairly good electrolytic and polymer capacitors, the company also uses an FDB fan, which should last a long time. A 10-year warranty is another clue that this platform was designed to operate reliably.

As you can tell, we’re impressed with the new Focus platform. However, since all of our tests allow us to be extra picky, we did spot a couple of areas where there is room for improvement. First, the 3.3V rail’s transient response isn’t particularly good. Normally it should remain within 3% in all scenarios. This rail might be used lightly by most modern PCs, but it’s still required by the ATX spec and needs to perform well. We’re also bothered by the SSR-750PX’s EMI filter, which apparently needs a little tuning in order to be more effective. Controlling conducted (and radiated) EMI emissions is tough, but we are sure that Seasonic’s engineers are up to the task. And as it pertains to protection features, we believe that over-power protection should be set around 120% of the PSU’s maximum-rated capacity instead of 135%. The over-current protection triggering point at 5VSB should be much lower as well.

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Seasonic Focus Plus Platinum 750 PSU Review

Product Name: Seasonic Focus Plus Platinum 750 PSU

Product Description: The technologies applied and the components and materials used in the manufacturing of the FOCUS+ Platinum 750 watt power supply do not compromise on Seasonic’s legendary high standards. This product received 80 PLUS® Platinum certification, where efficiency reaches 92 % at 50 % system load. Superior dynamic response, great system stability, maximized 12 V DC rail output and a state-of-the-art fan control system are just some of the features that will awe enthusiasts who become familiar with this power supply. With Seasonic’s 10 years warranty added: it is as good as irresistible.

Price: £124.99

Currency: British Pounds

Availability: InStock

  • Our Rating 9.5
    9.5/10

Our Verdict

Seasonic’s 750W Focus Plus Platinum is a true bargain in the £124.99 range. It offers superb overall performance, is quiet, employs fully modular cabling, and fits in a compact enclosure. The cherry on top is 10-year warranty coverage.

Overall
9.5/10
9.5/10
Sending
User Review
3.75 (4 votes)

Pros

  • Price
  • Full power at 47°C
  • High efficiency
  • Good build quality
  • Quiet operation
  • 10-year warranty
  • Compact dimensions

Cons

  • EMI
  • 3.3V transient response
  • High OPP
  • 5VSB OCP
  • Short distance between peripheral connectors