What kind of power supply tests would it be without Seasonic represented? Under this brand, which has long held one of the best reputations among computer power supplies, there are already three lines supporting the Best ATX 3.0 PSU standard. In the tests, we will focus on the most affordable one, the Vertex GX. Before we get into the electrical measurement results, though, let’s go over the basic design details.
From the outside
The grille in front of the fan is characterized by a large degree of opening and a shape that could avoid unpleasant resonant frequencies with undesirable tonal peaks. This is due to the large holes (with fewer edges on which intake airflow chopping occurs) and rounded edges.
The size of the power supply casing is an average of 160 mm in length. The cabling is fully modular, with virtually all power supplies. However, the design itself is already different. It is neither “glued” flat cables nor cables in a common mesh. Each wire has its insulation and is separated from the adjacent wire.
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This design allows for above-standard management where the risk of “too thick bundles,” typically of cables in a shared mesh in the space behind the motherboard, is minimized, and they can also be better molded in some situations than flat cables with “glued” wires.
The rubber-coated insulation is, moreover, also quite soft, considerably softer than on the older BeQuiet Dark Power Pro 12 power supplies, whose hard cables held their shape almost as if they had a solid core. That’s not the case with this Seasonal design, though. Best ATX 3.0 PSU good flexibility is retained even though large gauge 1.31 mm2 (16 AWG) wires are used. A smaller cross-section (18 AWG) is only used in cables of connectors with lower current carrying capacity. However, all 12-volt CPU and PCIe power cables are made of more robust wires.
There is one 12VHPWR connector capable of 600 W (50 A) load as required by the Best ATX 3.0 PSU standard. There are three traditional 6+2-pin PCI connectors for Radeons or lower-end GeForce graphics cards. All on separate cables.
The constant current load on the +12 V branch is 70 A. At peak, for 100 μs, the power supply should sustain up to 140 A. The Seasonic Vertex variant of the test PSU has a sticker rating of 850 W. It’s an 80 Plus Gold certified GX-850 model, which at 230V should achieve 90% electrical efficiency in the most efficient load band around 50%.
Besides the 850 W variant (GX-850), there’s a weaker 750 W one (GX-750) and two more powerful with 1000 W (GX-1000) and 1200 W (GX-1200).
However, under the Vertex brand but with “PX, “Seasonic also offers models with an 80 Plus Platinum rating. And then, only the Prime – TX-1300 (with 1300 W) and TX/PX-1600 (with 1600 W) achieved the “Titan” sticker.
And from the inside
After a very simple removal of the cover (by removing the four screws, where there is a warranty seal over one of them), you get to, among other things, a 135 mm fan with the designation HA13525F12F-Z. A 2-pin connector connects it and uses fluid bearings. By default, cooling is semi-passive, with the fan starting from 30 percent load. This (hybrid) mode is switched off by a button on the rear panel, ensuring active cooling at all times, even at low power supply loads.
The fan also cools the rather large heatsink on the DC-DC converter. The design of this aluminum monolith is well-articulated comb-like.
Capacitors are fully under the responsibility of Nippon Chemi-Con’s “105-degree” ones (there are two 420 V KMR models with a capacity of 330 μF in the primary) and Nichicon ones (secondary).
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