Best Power Supplies

Corsair's SF450 is an SFX PSU featuring amazing performance and very silent operation. It easily takes the top place in the 450W SFX category and its only downside looks to be the increased price, which is justified by the excellent build quality.

An overall great PSU with a down to earth price. Bitfenix should be proud of its Whisper line, which meets eye-to-eye the toughest competition in the Gold efficiency category. You can't go wrong with the BWG550M, it is as simple as that.

In addition to very high performance, Corsair's RM550x also features dead silent operation, even under extremely hard conditions. The only major downside of this PSU is its high price, compared to the competition in this wattage category.

This is the best passive PSU that money can get you today. It is super efficient, its overall performance puts to shame many high-end active cooling PSUs and it can easily support a strong gaming system. The only downside is the stiff price, but you get what you pay for, with this product.

The RM650x is a high performance PSU featuring great build quality and a very silent operation. It is offered at a fair price and the ten-year warranty is the cherry on top. Its major problem seems to be the harsh competition from EVGA's similar priced offerings, especially the 650 P2 model.

The 650 P2 is another excellent EVGA PSU with very high performance in all areas, also featuring very silent operation. The PSU's only downside is its high price, but in this case you get what you pay for.

The new Seasonic Titanium platform is awesome! The 650W Prime model offers amazing performance in all areas and super high efficiency. Hands down this is the best 650W unit money can buy today and on top of that it is dead silent, even under worst case scenarios.

If you don't need the extra bell and whistles of the RM750i and want to save some bucks then the RM750x is a good choice, however the price difference between these two products is small.

The Seasonic FOCUS Gold 750W is a high performance PSU featuring super compact dimensions, a fully modular design and a selective semi-passive operation. All above can be yours at a very good price which doesn't exceed 100 bucks and the cherry on top is the ten-year warranty. If Seasonic manages to improve the not so good 3.3V transient response and lowers the output noise, the FOCUS units will be even better.

Thermaltake used the best version of this Gold Sirfa platform. The TPG-0750F-R is highly efficient and has excellent ripple suppression. Given its good pricing scheme, the Japanese caps and the HDB fan, it is definitely worthy of your attention.

The 750 P2 is a top-notch PSU with low ripple on all rails, tight load regulation and high efficiency. Its fully modular cable design along with the selectable semi-passive operation, the Japanese caps and the 10-year warranty complete the package. With a richer, in operational modes, fan profile and a lower speed fan this PSU would offer an even more silent operation, which is highly desired by many users nowadays.

A top performing PSU which with higher efficiency at 5VSB and a less aggressive fan profile could be close to perfection. Super Flower's new platform is awesome and EVGA did good to use it, for replacing the aged G2 units (which still rock though).

At this price tag (110 bucks) the Seasonic FOCUS Plus Gold 850 is a bargain and easily receives a recommendation from us. Besides high performance it is also super compact, allowing its installation even in small sized chassis. Seasonic's new FOCUS family managed to capture our full attention so far.

EVGA's SuperNOVA 850 P2 has amazing performance, silent operation, compact dimensions for a 850W PSU and is backed up by a hefty 10-year warranty. If you want to invest in one of the best PSUs in this category, then the 850 P2 is definitely for you.

The EVGA SuperNOVA 850 T2 is a super high performance PSU with a price to match, which means its performance per dollar ratio is low. Nonetheless, this is the most efficient PSU we have tested so far and probably the best in the 850W category.

The Seasonic Prime Titanium 850 is probably the best 850W PSU available on the market today. It features top-notch performance, dead silent operation, nice looks and a hefty 10-year warranty. The only problem is the stiff price, but in this case you get what you pay for.

A high quality PSU with excellent performance and a hefty warranty. What more to ask from Corsair? Probably a way to offer the same excellent ripple suppression without using in cable caps, which make the cables less flexible and bulky.

The SSR-100PD Ultra is the best performing PSU with 1kW capacity that money can buy today. We haven't tested of course its Titanium (or ETA-A+) sibling yet, which will most likely achieve an even higher overall performance rating, so for the moment this model is the king of our charts.

This is another high-end Corsair PSU that, aside from great overall performance, also offers quiet operation (clearly indicated by the LAMBDA-A+ badge it carries). The collaboration between CWT and Corsair is paying off, and we appreciate that much attention is paid to the 5VSB circuit's efficiency. This doesn't seem to be as high of a priority to EVGA and Super Flower.

The Toughpower DPS G RGB 1250W is a high-performance PSU that packs some interesting features, including an RGB fan and compatibility with Thermaltake's SPM cloud service. Its only problem is the stiff competition in this price range from Corsair's and EVGA's high-end models.

Our final verdict can be summarized as follows: this is best PSU that money can buy today.

The Corsair AX1600i is the best PSU that money can buy today, period. It offers top performance on all areas and it uses an innovative platform, which provides us a glimpse at the future of power supply design.