PC Power Supply: What wattage to choose in 2026?

It's the component nobody talks about, yet it determines the stability of the entire machine. The power supply unit, or PSU, powers the CPU, graphics card, fans, and storage from the mains. When it's undersized or of poor quality, the symptoms never look like a power supply issue: reboots mid-game, black screens under load, crashes mistakenly attributed to graphics drivers.

In 2026, the topic has become relevant again for two reasons. Recent graphics cards exhibit very short but very high power spikes, and the ATX 3.1 standard has changed how the GPU is connected. This guide covers the entire issue: how many watts, what certification, what connectors, and how to avoid common mistakes.

How many watts for your configuration?

The rule of thumb is simple: add up the typical power consumption of the CPU and the graphics card, add about 100 W for the rest of the machine (motherboard, memory, SSD, fans, USB peripherals), then factor in a 30% margin above that total.

This margin is not wasteful. It serves to absorb instantaneous GPU power spikes and places the power supply in its optimal efficiency zone, typically between 40% and 60% load. A power supply constantly running at 90% capacity heats up more, ventilates louder, and ages faster.

Typical power consumption of common components

Component	Typical power consumption under load
AMD Ryzen 3 3200G / Ryzen 5 5500	65 W
AMD Ryzen 5 5600GT / 5600X	65 to 88 W
Intel Core i3-13100F	60 to 90 W
Intel Core i5-12400F / i5-14400F	65 to 148 W peak
AMD Ryzen 7 5700X	65 to 90 W
AMD Ryzen 7 7700X	105 to 142 W peak
NVIDIA RTX 3050 6 GB	70 W
Intel Arc B580 12 GB	190 W
NVIDIA RTX 5060 8 GB	145 W
NVIDIA RTX 5060 Ti 8 GB	180 W
NVIDIA RTX 5070 12 GB	250 W
AMD RX 9070 XT 16 GB	304 W

Translation to power supply wattage

Based on these figures, here are the most common power levels for configurations sold today:

• 450 to 500 W: Machines with integrated graphics (Ryzen 3 3200G, Ryzen 5 5600GT) or with an RTX 3050 6 GB, which, on some models, can even run solely on PCIe port power.
• 550 to 600 W: Mid-range configurations with RTX 5060, Intel Arc B580, or RTX 5060 Ti paired with a 6-core processor. This is the best-selling tier, offering the best price/safety margin compromise.
• 650 to 750 W: RTX 5070, RX 9070 XT, or a configuration with an 8-core processor and multiple drives. 750 W also leaves room for a future GPU upgrade.
• 850 W and up: Reserved for high-end graphics cards exceeding 350 W and multi-drive workstations.

A common point: no, a 750 W power supply does not constantly consume 750 W. It delivers what the machine needs at any given moment. The number on the box is a ceiling, not a consumption figure.

80 PLUS certification: What it really measures

The 80 PLUS logo indicates the efficiency of the power supply, meaning the proportion of electricity drawn from the wall that actually reaches the components. The rest is dissipated as heat. An 87% efficient power supply delivering 400 W draws about 460 W from the outlet: the missing 60 W heats up the case.

Certification	Efficiency at 50% load	Recommended use
80 PLUS (white)	85 %	Office, entry-level configurations
80 PLUS Bronze	88 %	Gamer PC standard
80 PLUS Gold	92 %	Powerful configurations, long sessions
80 PLUS Platinum	94 %	Workstations, continuously running machines

For the vast majority of gamers, a good quality Bronze is more than enough. Upgrading to Gold is justified when the machine runs several hours a day, or when the case is poorly ventilated and every watt of saved heat matters.

However, beware of a common pitfall: 80 PLUS certification says nothing about the quality of internal protections, voltage stability, or capacitor lifespan. An uncertified power supply sold for thirty euros with an advertised 700 W rarely delivers what it promises, and it's precisely this type of component that endangers the rest of the machine.

ATX 3.1 and 12V-2x6 connector: What has changed

The ATX 3.1 standard, introduced to support recent graphics cards, requires power supplies to support very brief power spikes that can reach double their nominal power without triggering safety shutdowns. This is a direct response to the electrical behavior of modern GPUs, which rapidly alternate between low and maximum load.

In practice, a 650 W ATX 3.1 power supply handles a 250 W graphics card better than an older ATX 2.x power supply of the same wattage. On an older generation configuration, it's not uncommon to have to go up a notch in wattage to achieve the same stability.

The 12V-2x6 connector

The 12V-2x6 is the revised version of the 12VHPWR connector. The sensing pins have been shortened: if the plug is not fully inserted, the graphics card simply does not receive power instead of operating with partial contact. This is a direct correction to the overheating issues observed on the first version of the connector.

Three practical recommendations if your GPU uses this connector:

• Push the plug in until it clicks, and visually check that there is no gap between the connector and the port.
• Do not bend the cable less than 3.5 cm from the connector. Too tight a bend right behind the plug mechanically stresses the pins.
• Use the native cable supplied with the power supply, never one from another brand: the pinout on the PSU side is not standardized among manufacturers.

Modular, semi-modular, or non-modular?

On a non-modular power supply, all cables permanently exit the block, including those you will never use. They need to be tucked away somewhere, usually behind the motherboard tray, which hinders airflow and complicates assembly.

Semi-modular keeps the two essential cables (24-pin motherboard and 8-pin CPU) fixed and allows PCIe and SATA cables to be detached. This offers the best practicality/price ratio and is by far the most common format for mid-range power supplies.

Fully modular doesn't change performance, but it significantly simplifies cabling in small cases and makes cleaning easier years later. On a machine with a tempered glass window, the visual difference is real.

When should you replace your power supply?

A quality power supply easily lasts eight to ten years, but some signs should alert you:

• Spontaneous reboots only during heavy load phases, typically when launching a game or rendering.
• Instant black screen, without a blue screen or error message, followed by an automatic reboot.
• High-pitched electrical noise that varies with graphic load and worsens over time.
• Burning or plastic smell near the rear grille of the case. In this case, turn off the power supply immediately.

If you switch graphics cards to a significantly more power-hungry model, always check the available connector before purchasing. Going from an RTX 3050 to an RTX 5070 almost doubles the GPU's power consumption, and the power supply that was sufficient for the former will very likely be at its limit for the latter.

In summary

Choosing your power supply comes down to answering four questions: what total power do my components demand, what margin do I keep above that, what certification matches my usage, and what connectors does my graphics card require? The rest is a matter of assembly comfort.

For configurations assembled in France by DSGate, the power supply is sized for the installed GPU, with the necessary margin to absorb power spikes. You can consult the technical details of each machine on the DSGate gamer PC range, or write to us at contact@dsgate.fr if you are hesitating between two configurations.