To start off with the best power supply that you could go for. The Seasonic Prime 650W 80+ Titanium (average price of 171 pounds / 195 euros), one of the two Titanium-power supplies from the test, has an excellent performance in almost every regard plus it is the most efficient power supply we have tested. Even though it does not reach the efficiency in our procedure that the 80Plus Titanium certificate promises, it still performs better than all the other power supplies in the test. What is even more surprising is that it is also very efficient at low load. Bear in mind that you will not earn back the higher purchase price with a lower power consumption. That is why it is solely the best option for ambitious buyers who are willing to pay the price for it. This, however, does not hold us back to reward it with an Ultimate Product award.
An almost as good alternative is the Be quiet! Dark Power Pro 11 650W (average price of 149 pounds / 170 euros). This power supply has the possibility to set as a single- or multi-rail, plug your fans directly on the power supply and it is (even) more silent than the Seasonic. It does however lack a bit of performance in ripple and efficiency, but it is also less expensive. Due to its extremely high quality and useful extras we also award the Dark Power Pro 11 with an Ultimate Product award.
The Be quiet! Dark Power Pro 11 650W is the best performing Platinum-power supply in the test. It has special features such as the possibility to put it in single or multi-rail. There are even fan-connectors on the power supply.
For now, you can find the best price/performance ratio in the Gold-segment, where you can find outstanding power supplies, for a significantly more attractive price. The Corsair RM650x (average price of 102 pounds / 116 euros) remains the best option. Both the ripple and the voltage stability are excellent, moreover it is inaudible whatever the load is. It only lacks a bit of efficiency, but the relatively low price makes up for this.
For now though, the best price-performance ratio is found in the Gold-segment, where you can find excellent power supplies with a lower price tag. The Corsair RM650x (average price of 103 pounds / 116 euros) remains the best choice here. Both the ripple and the voltage stability are excellent and it is inaudible at any load. Only the efficiency is slightly lacking, but the relatively low price more than makes up for this. In the 550 watt segment only the Cooler Master V-Series was able to compete with the Corsair RMx, but unfortunately this is not the case for the 650W variant (average price of 102 pounds / 115 euros). The main competitor is one of Corsair’s own products: the CS650M (average price of 87 pounds / 98 euros is slightly better than the RM650x in a lot of cases and also marginally cheaper – only the ripple is clearly worse, and the warranty period is a lot shorter. Because of this, we prefer the more modern model.
There are also enough solid power supplies that are less expensive. One of these cheaper options is the LC-Power LC6650GP4 V2.4 650W (average price of 82 pounds / 92 euros). This Gold power supply is rather efficient, modular and also barely audible under load. Disadvantages are the maximum ripple that is slightly too high and the fact that it is audible. Because of its good price-performance ratio is receives a Great Value award. Another alternative is the Cougar GX-S 650W 80 Plus Gold (average price of 72 pounds / 81 euros), which is quieter than the LC Power and has a lower ripple but is unfortunately not modular. Nevertheless this power supply deserves a Great Value award as well.
If you want to spend even less, the SilverStone Strider Essential 600W (average price of 51 pounds / 58 euros) is a basic power supply with acceptable performance. Of course you will have to accept the lower quality components, lower efficiency and the lack of modularity. This power supply is not suited for overclocking, but with regular use it is almost inaudibly quiet, while the voltages are still acceptable. A good modular alternative for the Strider Essential is the Sharkoon WPM600 600W (average price of 58 pounds / 66 euros). However, bear in mind that this model also suffers from clearly less stable voltages at high load. We would definitely recommend you spend slightly more and purchase one of the better power supplies.