Performance, Value, Noise & Efficiency
The following graph shows the SSR-750FX's total performance rating, comparing it to other units we have tested. To be more specific, the tested unit is shown as 100 percent, and every other unit's performance is shown relative to it.
Thanks to tight load regulation, a long hold-up time, and good ripple suppression, the SSR-750X comes close to Corsair's excellent RM750x, which costs around $10 more and has larger dimensions. If the 3.3V rail's transient response was better, Seasonic's offering would achieve an even higher performance score.
Performance Per Dollar
The following chart may be the most interesting to many of you because it depicts the unit's performance-per-dollar score. We looked up the current price of each PSU on popular online shops and used those prices and all relative performance numbers to calculate the index. If the specific unit wasn't available in the United States, we searched for it in popular European Union shops, converting the listed price to USD (without VAT). Note that all of the numbers in the following graph are normalized by the rated power of each PSU.
Seasonic employs aggressive pricing. With a $100 price tag, the SSR-750FX scores well on this chart.
The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30°C and 32°C (86°F to 89.6°F).
This is where the SSR-750FX falls behind its competition. An aggressive fan profile results in quite a bit of noise, whereas Corsair's RM750x, one of the quietest 750W PSUs, is far superior.
The following graph shows the average efficiency of the PSU throughout its operating range, with an ambient temperature close to 30°C.
The average efficiency results, which are based on thousands of different load combinations, put the SSR-750X close to the RM750x. Only the Thermaltake Toughpower Grand RGB 750W is notably above the rest of the pack.
MORE: Best Power Supplies
MORE: All Power Supply Content