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Performance, Noise and Efficiency
The SilverStone ST1200-PTS performs much better than its predecessor, the ST1200-PT, but still it is behind other high-end 1200W units, though these competitors are larger.
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).
The overall noise output is quite low, given the high capacity and the small footprint.
The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30°C.
This is a highly-efficient platform. The AX1000i that scores first in this chart has lower capacity and is 80 PLUS Titanium (and ETA-A+) certified, while the ST1200-PTS is an 80 PLUS Platinum unit (which manages to achieve an ETA-A+ rating though, which is usually only obtained by good 80 PLUS Titanium units).
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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.