The Silverstone HELA 2050 W is the strongest PSU money can buy today. Super Flower has a 2 kW unit, the Leadex Platinum 2000 W, which is still highly competitive, but it is hard to find, especially in the US. Pricing for the HELA may make you want to cry, but most users won't need this much power. In contrast, users with increased power needs have already invested into super-expensive graphics cards and other hardware, so $600 for the heart of their system won't discourage them.

Given the purported insane power requirements for the next GPU generation, at least for NVIDIA, I believe a new era for super-powerful PSUs like the HELA 2050 is nearly upon us; Silverstone did well to be the first to break the 2 kW barrier. Weird about power-hungry next-generation GPUs is that they are supposed to become more efficient the further along technologically. However, games and applications are becoming more demanding, so there is reason for energy consumption to increase considerably as well, which means power supplies to support these demands are required. The more significant problem with current and next-generation GPUs is not the maximum sustained power delivery of PSUs, but their performance with transient loads; based on what I have heard, requirements surrounding transient loads will hence dramatically increase in the upcoming ATX specification.

High transient loads can bring even powerful PSUs to their knees. To cope with the increase more capacity is required on the secondary side, which mostly translates into more electrolytic, polymer, and MLCC caps. We might see Panasonic's POSCAPs in power supplies soon, which are small, so space won't be an issue, and offer more capacitance than the currently widely used MLCC caps. POSCAPs don't come cheap, though.

The HELA 2050 has enough power to start a truck and comes with a 12-pin PCIe connector, so it will be able to support the next-generation graphics cards once those come out. The only problem is that the new power connector also has four sense connectors, so it is 12 + 4 pin, which means the graphics card will be limited to the lowest power setting, most likely 150 W. I expect workarounds to be implemented, either through custom firmware or dummy plugs, but nobody knows for sure yet. Until the new ATX specification is released, we do not know all the requirements for the new PCIe connector and its power requirements, so the best manufacturers and brands can do for now is provide compatibility with the 12-pin connector NVIDIA introduced with its current-generation GPUs.