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Final Analysis
Seasonic's new Focus Gold line is interesting to us, since the company keeps its prices in check without negatively affecting performance or reliability. The SSR-750FX's feature list includes a selectable semi-passive mode, ultra-compact dimensions, fully modular cabling, and high-quality filtering caps. A 10-year warranty shows that Seasonic is exceedingly confident in its Focus PSUs.
The only downside we ran across during our performance testing was the 3.3V rail's response in our tough transient tests. This rail is only lightly used by modern systems. However, it would be nice to see Seasonic address this problem in future revisions of its design. We also weren't particularly fond of the fan's aggressive profile, which leads to increased noise output (particularly compared to the much quieter Corsair RM750x). On one hand, this PSU's compact dimensions are an advantage when it comes to installation and compatibility with small cases. On the other, Seasonic wasn't able to use a 135mm or 140mm fan to keep things quiet. Instead, the company went with a 120mm FDB fan that spins fast in order to deliver adequate airflow.
Perhaps the most important family for Seasonic, its Focus PSUs cover a number of price and capacity points, hitting a much broader market than the Prime models. The SSR-750FX currently sells for $100, which is impressive given its features. Although the competition is really tough in this segment, it achieves a compelling value score. Combined with a 10-year warranty, the SSR-750FX a solid choice for anyone shopping for a reliable PSU.
Seasonic was clever enough to equip its SSR-750FX with two EPS connectors, making it compatible with high-end motherboards that require extra power for the CPU (AMD's Threadripper processors, for example). Currently, high-end 750W PSUs like Corsair's RM750x, RM750i, and HX750 only have one EPS connector, so the SSR-750FX enjoys an advantage in this space.
If Seasonic can find a way around its loud operating noise under tough conditions, either by using a larger fan or a relaxed profile (or a combination of both), it'll earn even bigger points in its competitive category. Limiting noise output in such a compact enclosure won't be easy for the company's engineers, though, since reliability cannot suffer in the process. But until Corsair decides to add a couple of EPS connectors to its popular 750W models, the SSR-750FX and EVGA 750 G3 are among the top offerings in this category. And EVGA's solution costs $20 more...
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