PC Power Supply: What wattage to choose in 2026?
It is the component that no one talks about, yet it determines the stability of the entire machine. The power supply unit, or PSU, provides power to the processor, graphics card, fans, and storage from the mains. When it is undersized or of poor quality, the symptoms never look like a power problem: reboots in the middle of a game, black screens under load, and crashes wrongly attributed to graphics drivers.
In 2026, the subject has become relevant again for two reasons. Recent graphics cards feature very short but very high power consumption spikes, and the ATX 3.1 standard has changed how the GPU is connected. This guide covers the issue: how many watts, which certification, which connectors, and how to avoid classic mistakes.
How many watts for your configuration?
The rule of thumb is simple: add up the typical power consumption of the processor and the graphics card, add about 100 W for the rest of the machine (motherboard, memory, SSD, fans, USB peripherals), then add a 30% margin on top of this total.
This margin is not a waste. It is used to absorb the instantaneous power spikes of the GPU and places the power supply in its optimal efficiency zone, generally located between 40 and 60% load. A power supply running constantly at 90% of its capacity heats up more, the fan runs louder, and it ages faster.
Typical consumption of common components
| Component | Typical 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 into power supply wattage
Based on these figures, here are the tiers most commonly seen in configurations sold today:
- 450 to 500 W: Machines with a processor with integrated graphics (Ryzen 3 3200G, Ryzen 5 5600GT) or with an RTX 3050 6 GB, which incidentally gets by with power from the PCIe port on some models.
- 550 to 600 W: Mid-range configurations with an RTX 5060, Intel Arc B580, or RTX 5060 Ti paired with a 6-core processor. This is the most popular tier, and the one that offers the best price/safety margin compromise.
- 650 to 750 W: RTX 5070, RX 9070 XT, or a configuration with an 8-core processor and several drives. 750 W also leaves the door open for a future GPU upgrade.
- 850 W and more: Reserved for high-end graphics cards exceeding 350 W and multi-drive workstations.
A point that often comes up: no, a 750 W power supply does not consume 750 W at all times. It delivers what the machine needs at any given moment. The figure on the box is a ceiling, not a constant consumption.
The 80 PLUS certification: what it really measures
The 80 PLUS logo indicates the efficiency of the power supply, i.e., the proportion of electricity drawn from the mains that actually reaches the components. The rest is lost as heat. A power supply with 87% efficiency that delivers 400 W draws about 460 W from the socket: the missing 60 W heats up the case.
| Certification | Efficiency at 50% load | Recommended usage |
|---|---|---|
| 80 PLUS (white) | 85% | Office work, entry-level configurations |
| 80 PLUS Bronze | 88% | Standard for gaming PCs |
| 80 PLUS Gold | 92% | Powerful configurations, long sessions |
| 80 PLUS Platinum | 94% | Workstations, machines running continuously |
For the vast majority of gamers, a good-quality Bronze is more than enough. The upgrade to Gold is justified when the machine runs for several hours a day, or when the case is poorly ventilated and every watt of saved heat counts.
However, be wary of a common pitfall: 80 PLUS certification says nothing about the quality of internal protections, voltage stability, or the lifespan of capacitors. A non-certified power supply sold for thirty euros claiming 700 W rarely delivers what it promises, and it is precisely this type of component that puts the rest of the machine at risk.
ATX 3.1 and 12V-2x6 connector: what has changed
The ATX 3.1 standard, which arrived to support recent graphics cards, requires power supplies to withstand very brief power spikes of up to double their rated power without triggering safety shutdowns. This is the direct response to the electrical behavior of modern GPUs, which alternate very quickly between low load and maximum load.
In practical terms, 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. With a previous-generation configuration, it is not uncommon to have to move up one tier in watts 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 receives no power instead of operating with a partial contact. This is a direct fix for the overheating problems 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 verify that there is no play between the connector and the port.
- Do not bend the cable within 3.5 cm of the connector. A bend that is too tight just behind the plug mechanically stresses the pins.
- Use the native cable provided with the power supply, never one from another brand: the pinout on the PSU side is not standardized between manufacturers.
Modular, semi-modular, or non-modular?
On a non-modular power supply, all cables emerge from the unit permanently, including those you will never use. You have to store them somewhere, usually behind the motherboard tray, which hinders airflow and complicates assembly.
The semi-modular keeps the two essential cables (24-pin motherboard and 8-pin CPU) fixed and leaves the PCIe and SATA cables detachable. It is the best practical-to-price ratio, and by far the most common format on mid-range power supplies.
Fully modular does not change performance, but 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 a few warning signs should alert you:
- Spontaneous reboots only during heavy load phases, typically when launching a game or rendering.
- Instant black screen, with no blue screen or error message, followed by an automatic reboot.
- High-pitched electrical noise that varies with graphics load and worsens over time.
- Smell of heat or plastic near the rear grille of the case. In this case, cut the power immediately.
If you are changing your graphics card for a significantly more power-hungry model, always check the available connector before buying. Moving from an RTX 3050 to an RTX 5070 almost doubles the GPU consumption, and the power supply that was sufficient for the first will very likely be at its limit for the second.
In summary
Choosing your power supply comes down to answering four questions: how much total power do my components require, what margin do I keep above that, which certification matches my usage, and what connectors does my graphics card require. The rest is a matter of assembly convenience.
On 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 gaming PC range, or write to us at contact@dsgate.fr if you are hesitating between two configurations.