Performance, Performance Per Dollar, Noise and Efficiency Ratings
The following graph shows the PSU's total performance rating, comparing it to other units we have tested in the past. To be more specific, the tested unit is shown as 100 percent, and every other unit's performance is shown relative to it.
At least with 230V input, where there are no ripple spikes at high operating temperatures and full load, the new ST75F-GS easily passes SilverStone's first revision. However, the competition is far ahead when it comes to performance. The only major advantage of this platform is its compact dimensions.
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.
Both versions share the same price, so naturally the new ST75F-GS takes the lead from the older model since it has better overall performance...with 230V input at least. Unfortunately for SilverStone, our U.S. audience uses 115V. Not that it ends up mattering. After all, compared to the rest of the competition, the ST75F-GS V2 doesn't look so appealing. Given the same budget, you have plenty of good alternatives, especially if small dimensions aren't a priority.
The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 28 and 30 °C (82 to 86 °F).
In the noise output section, the ST75F-GS V2 is hugely improved compared to its predecessor, and matches most of the competition. However, the similarly-priced Corsair RM750x serves up higher performance and silent operation. The catch is that it's 4cm longer than the tiny ST75F-GS V2.
The following graph shows the average efficiency of the PSU throughout its entire operating range, with an ambient temperature between 28 °C and 30 °C.
Although both Corsair units had higher efficiency than SilverStone's offering at 230V, you can see that the ST75F-GS takes a lead at 115V.