Seasonic is a well-known company in the PSU market; in addition to retail sales, its platforms are also used by many other companies, including Antec, Corsair, EVGA and Fractal Design. One of Seasonic's budget Gold-rated lines is the G series, which consists of five products with capacities ranging from 360 to 750W. Today we're looking at the G-450, which, as its model number implies, offers up to 450W of capacity.
All G-series power supplies use a semi-modular cabling design, have compact dimensions and are cooled by a 120mm fan. In addition, they are backed by a five-year warranty, which is rather long for the standards of this category. Seasonic claims that the performance of its G-series PSUs is top-notch, and we believe the company since we've tested a number of models in this line, including units based on the same platform. The results were very good in all cases.
The G-450 is a high-quality low-capacity PSU able to cover not only entry-level systems but also mid-range ones with respectable GPUs (thanks to its two auxiliary PCIe connectors). Power supplies like this are popular with enthusiasts who know they don't need massive output, only to use a fraction of it. Typically, lower-wattage PSUs achieve significantly higher efficiency at light loads compared with more powerful PSUs, so if your system's energy needs are low, then you should avoid buying a high-capacity supply. Otherwise, you'll pay more for the unit itself and incur increased operational costs compared to a less-powerful model offering the same efficiency characteristics. On the other hand, if you plan to add a second graphics card, you'll need a power supply with at least four PCIe connectors and 500W+ capacity. The G-450 would fall short in that case.
Besides 80 PLUS Gold efficiency, the G-450 is also Haswell-ready and can deliver its full power continuously at up to 50 degrees Celsius (122 degrees Fahrenheit) ambient temperature. This is a clear indication that it is based on a solid platform with good components that are able to withstand tough conditions. The PSU offers all necessary protections, including OCP (over-current protection), even though it sports a single +12V rail. We typically don't see OCP in PSUs with one +12V rail; Seasonic most likely added this protection because of the unit's low capacity.
Cooling is handled by a 120mm double ball-bearing ADDA fan. It's a good-quality cooler that should work flawlessly for many years. And even though the price is on the high side, we believe the build quality of this product justifies it.
|Total Max. Power (W)||450|
The single +12V rail can deliver the PSU's full power alone; it has enough amperage to feed a high-end GPU. The minor rails are strong for a modern system that is covered by a 450W power supply, and the 5VSB rail has the typical capacity for a contemporary PSU.
Cables & Connectors
|Description||Cable Count||Connector Count (Total)|
|ATX connector 20+4 pin (550mm)||1||1|
|4+4 pin EPS12V (570mm)||1||1|
|6+2 pin PCIe (610mm)||2||2|
|Four-pin Molex (400mm+120mm+120mm)||1||3|
|Four-pin Molex (300mm+120mm)||1||2|
|FDD Adapter (+110mm)||1||1|
This unit has the typical cable/connector configuration for a respectable low- to mid-capacity PSU. Seasonic equips it with a single EPS connector and a pair of PCIe connectors, through which the G-450 can easily deliver its full power. In addition, six SATA and five four-pin peripheral Molex connectors are more than enough for this category.
Overall, cable length is adequate with one exception: the EPS cable, which in our opinion should be at least 60 centimeters in length. All connectors use 18-gauge wires, which are recommended by the ATX spec.
Since this PSU features a single +12V rail, we do not have anything to say about its power distribution.