Joined in 2023 
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This isn't really a massive concern, and only really applies to high end GPUs (as they are very large and have huge power budgets), but it can cause system crashes/shutdowns if the PSU isn't able to handle the spikes, either through OCP/OPP triggering or through voltage dropping too low for the system to stay on. And it varies a lot between PSUs - I've seen 850W units shut down when powering a 3080, but I've also seen 600W units powering 3090s with no issues. Hence why the ATX 3.0 spec is trying to standardize this somewhat. 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. It’s almost impossible to find a non-modular 850W PSU. But some manufacturers design semi-modular ones which are affordably priced.
You’re more likely going to need an ATX power supply. That’s unless the case manufacturer specifically states you use an SFX one. Modular Design
Almost all PSU manufacturers design PSUs with the 80 Plus efficiency rating certification. The “80 Plus” rating system is the industry standard! The 80 Plus efficiency rating has since expanded in recent years to categorize different PSUs from the least to the most efficient. I presume you already have the estimated total wattage that your PC will draw, and an 850W PSU is the ideal power supply unit to complete the build. wolfIf I'm interpreting this correctly, that's mitigation for transient power spikes? and again if I'm interpreting correctly, that means ~1700w spikes for at least 100 µs are accounted for?
Since the new era GPUs require more power— especially the RTX 4000 series, an ATX 3.0 PSU ensures your build is future-proofed for power-hungry GPUs. Color Due to size restrictions, the designers were forced to use three APFC capacitors, the combined total capacitance of which is 420 uF. All three capacitors are supplied by Nippon Chemi-Con. There are two primary side inversion MOSFETs that form the heart of a half-bridge design, feeding a rather small unique transformer. Primary side: APFC, Half-Bridge & LLC converter Secondary side: Synchronous Rectification & DC-DC converters
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Once you have decided on the form factor and modular design, the next thing you need to consider is the efficiency rating you can afford. A fully modular power supply unit lets you use only the cable you need for simple and clean cable management.
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.I recommend getting a fully modular PSU since it offers total control of your build’s cable management. Efficiency Rating
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