SilverStone Extreme Series EX1200R Platinum 1200W, SFX-L 4.1

The SilverStone Extreme 1200R Platinum SFX-L PSU excels in delivering 1,200 watts of power with impressive efficiency, making it an ideal choice for high-performance compact builds. However, its very high price will deter many users.

The SilverStone Extreme 1200R has proven to be a capable, high efficiency power supply in our testing over the last week. It firmly targets a niche audience building into a small SFX-L form factor chassis – the small physical footprint of 125 mm x 130mm x 63.5mm ensures maximum compatibility with a wide array of chassis designs. Technically, load regulation is tight, and it passed the cross load test without any issues at all across the full load gamut. While ripple suppression isn't the best we have seen, it still held firmly within industry rated parameters. Under load, the Extreme 1200R is quiet, and it is only at higher load demands that the fan starts to spin up to compensate for rising temperatures. It could be classed as a fairly quiet unit, which is extremely impressive considering the small physical dimensions. Internally, the Enhance OEM design is clean and well thought out, although I was very surprised to see 85C-rated capacitors in the primary stage, especially as SilverStone show images of 105C caps on their product page over HERE. While the design incorporates high grade Japanese capacitors by Rubycon (2x 470uF USK) we would expect to see high end Platinum units like this 1200R equipped with 105C-rated caps. As mentioned previously in this review, we did speak to Silverstone about this and they said due to height restrictions they had to use 85C capacitors in the primary stage.