The FSP Dagger Pro 850W PSU is a great option for anyone wanting to put together a compact PC. If you plan on using a smaller PC case that only takes an SFX or SFX-L PSU, you'll need to use such a power supply. You can do much worse than the Dagger Pro 850W, and it's absolutely possible to choose a unit from an unknown brand that runs the risk of frying your expensive components. It would be irresponsible for us to include a 600W 12VHPWR connector with a 850W power supply as many high end CPUs are now capable of drawing 200W+ all by themselves, leaving only 50W for everything else!Under what real scenario will someone be drawing 600w gpu and 200w cpu at the same time on a SFX psu? But I get it for liability reasons.

As always, buy sensibly. Over-speccing a PSU makes more sense at the low end, where quality differences are more readily apparent. If you're running an extremely high end system, a 100-200W buffer on the high end is sufficient. For as much time as they'll spend near the "sweet spot" of that efficiency curve, they'll spend just as much time on the low end of it during typical idle or desktop usage.

Consider upcoming GPU power requirements. Although the best graphics cards are usually more power-efficient than previous generations, their power consumption increases overall. This is why the latest 12+4 pin connector that the upcoming generation graphics cards will use will provide up to 600 W of power. Currently, a pair of PCIe 6+2 pin connectors on dedicated cables are officially rated for up to 300W, and three of these connectors can deliver up to 450W safely. You should also add the up to 75W that the PCIe slot can provide in these numbers. A Phanteks Revolt power supply can match the needs of modern components. With many high-performance CPUs requiring over 200W and GPUs reaching 450W+, an 850W supply is highly recommended. With its modular design, the Revolt PSU can support a wide variety of devices including NVIDIA RTX 40 Series GPUs, thanks to its dedicated 12VHPWR output. This new connection can deliver an astounding 600W along a single cable. All power is supplied safely thanks to the many forms of output protection Phanteks has built into the design, including Overpower, Over Voltage, Short Circuit, and Over Temperature protection. Plus Titanium is about as good as you will get from consumer power supplies and Gold is pretty much slap-bang in the middle. But looking at the table above, the actual differences between each grade are small. FSP includes the following cables with the Dagger Pro SFX:

I recommend getting a fully modular PSU since it offers total control of your build’s cable management. Efficiency Rating ARFThe best efficiency is at 50% of the rated. So, if the PSU is 850W, then the desired total power requirements from the components should be around 425 watts.The "Buy a PSU rated at twice what you'll actually need" efficiency argument hasn't made much sense since the early 2000s. PSUs today are far more efficient overall than they used to be, across a much wider range of power delivery. :)