Nowadays, most power supplies have compact dimensions. Burst-mode operation allows modern power supply designs to be highly efficient under very light and light loads regardless of the maximum power output.Īnother important factor is the PSU's size. Based on the newest ATX specification, all PSUs should achieve over 70% efficiency at 10 W (500 W) of their maximum-rated-capacity load. In the past, high wattage PSUs suffered from low efficiency at light loads, but that's not true anymore. A safe choice is a PSU with at least 20% headroom over your peak wattage, not only for future upgrades, but also because even the best power supply delivers its highest efficiency at loads in the 30%–50% range of its maximum rated capacity. The peak wattage you see will prove useful in deciding on your next PSU purchase.
The best way to evaluate your power supply requirements if you want to replace your current unit is to use a kill-a-watt device and run an intense benchmark. While manufacturers provide TDP (Thermal Design Power) numbers, these can often be wildly inaccurate, so the best way is to look at reviews and just add up all the numbers. The second-most energy demanding component is the processor. There is also the Cybenetics GPU database, and of course reviews from other sites.
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The most energy-demanding component in a PC is the graphics card, and the best way to find out its power consumption is to read one of our reviews, where power consumption is detailed under various scenarios and with comparisons. Yet another issue is the transient response of a power supply to sudden loads, which can lead to instability if poor. Some of these power spikes can lead to the PSU shutting down if any of its protection features are triggered (usually overcurrent protection). Power spikes CPUs and GPUs can create are another issue PSU calculators don't even touch. There are some PSU calculators, but I wouldn't rely on them too much because even two identical parts (e.g., processors) can differ significantly in terms of power consumption, mostly under overclocked conditions, including GPUs. Power Supply Shopping TipsThe most frequent questions are what wattage will be required and whether it will it be enough.
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If you want to learn more about a specific power supply model, why we recommend it, or what the alternatives are, just click on it to be redirected to the corresponding section on the second page.Īlternative: Super Flower Leadex III ARGB Gold 550 WĪlternative: Seasonic Focus Plus Platinum 650 WĪlternative: Antec Signature 1000 Titanium Our Best Power Supply RecommendationsThe table below depicts the best PSU for every possible scenario. The recommendations are backed by a wealth of testing data and pricing. In this article, I offer my picks for the best power supplies across various categories defined by needs and not just budget. Furthermore, a quiet power supply will always be preferred over a noisy model. The price tag of the power supply is important, too, but a major factor only for the "best budget" power supply category. Besides just performance, the recommendations in this article also consider build quality and protection features.
The score is derived using an algorithm I started developing many years ago.
The primary factor for my selection of the best power supply is its overall performance score based on my in-depth reviews.
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