Corsair RM 2025: 4 Power Supplies on Offer, Gold and ATX 3.1 - How Many Watts Do You Need for Each GPU and CPU Model

If you're building or upgrading a PC in 2025, the choice of ATX power supply is as crucial as that of the GPU. Corsair today offers four solutions from its RM series that meet every power requirement, all united by Gold energy efficiency certification and full compatibility with the latest power standards.

What Does Gold Certification Really Mean?

The 80 PLUS Gold certification guarantees a minimum efficiency of 87% at 20% load, 90% at 50% load, and 87% at 100% load on the 115V circuit. The RM 2025 series goes beyond: it adopts the Cybenetics Gold certification, a more rigorous and detailed measurement system compared to the classic 80 PLUS, which assesses efficiency over a greater number of load points and also includes standby losses. The practical result is simple: less heat dissipation, less fan noise, and lower electricity bills.

-35% CORSAIR RM750e (2025)

Fully modular low-noise ATX power supply with 12V-2x6 cable - compliant with ATX 3.1 and PCIe 5.1, Cybenetics Gold efficiency, 105°C capacitors - Black
Price: 129.90 ** Now: 84.90 €**

The CORSAIR RM750e (2025) with 750W is the entry point of the line, available on Amazon for 84.90 €. It’s ideal for systems with mid-range GPUs like the RTX 4070 or RX 7800 XT. Fully modular, it complies with the ATX 3.1 standard and supports PCIe 5.1 thanks to the native 12V-2x6 cable, which replaces the old 16-pin connector, reducing the risk of overheating at the contacts. The Japanese capacitors rated at 105°C ensure long-term reliability.

-32% CORSAIR RM850e (2025)

Fully modular low-noise ATX power supply with 12V-2x6 cable - compliant with ATX 3.1 and PCIe 5.1, Cybenetics Gold efficiency, 105°C capacitors - Black
Price: 139.90 ** Now: 94.90 €**

The CORSAIR RM850e (2025) with 850W rises to 94.90 € on Amazon and offers significantly more headroom for powerful GPUs like the RTX 4080 Super or RX 7900 GRE. Same Cybenetics Gold certification, same native 12V-2x6 connector, same ATX 3.1 / PCIe 5.1 standard, 105°C capacitors. The additional 100W compared to the 750W model makes a difference during modern GPU consumption peaks, which can briefly exceed their declared TGP.

-29% Corsair 850W Power Supply 80 Plus Gold

Price: 169.90 ** Now: 119.90 €**

At 119.90 €, we find the Corsair 80 Plus Gold 850W unit, a solid solution with the proven 80 PLUS Gold certification with efficiency up to 90% at 50% load, necessary for those seeking reliability without necessarily requiring the latest ATX 3.1 compliance. An excellent choice for upgrading existing systems or builds that do not house the latest generation GPUs.

-33% CORSAIR RM1000x

Low Noise Fully Modular ATX Power Supply - Compatible with ATX 3.1 - PCIe 5.1 Support - Cybenetics Gold Efficiency - Native 12V-2x6 Connector - Black
Price: 209.90 ** Now: 139.90 €**

At the top of the range is the CORSAIR RM1000x with 1000W at 139.90 €. With an entire kilowatt of certified Cybenetics Gold power, this power supply is designed for the most demanding builds: systems with top-tier GPUs like the RTX 4090 or RTX 5090, overclockers, or workstations with high TDP CPUs like the Core i9 and Ryzen 9. The native 12V-2x6 connector, ATX 3.1 compliance, and PCIe 5.1 support make it future-proof for the coming years.

ATX 3.1 and PCIe 5.1: Why They Matter

The ATX 3.1 standard requires the power supply to handle transient power spikes up to 200% of the nominal power for brief moments. This is crucial with NVIDIA’s RTX 40 and 50 series GPUs and AMD Radeon RX 7000/9000, which exhibit very sharp consumption spikes. Without this compliance, an undersized or non-certified ATX 3.1 power supply can cause sudden system reboots during load peaks. The PCIe 5.1 12V-2x6 connector also ensures a safer and more stable connection compared to the previous 12VHPWR.

Which Wattage to Choose?

750W (RM750e, 84.90 €): GPUs up to RTX 4070 Ti / RX 7800 XT, mainstream CPUs up to 65-125W TDP
850W (RM850e, 94.90 €): GPUs up to RTX 4080 Super / RX 7900 GRE, CPUs up to 170W TDP, overall system with light overclocking
850W 80 Plus Gold (119.90 €): solid builds without the need for ATX 3.1, excellent price-performance ratio for upgrades
1000W (RM1000x, 139.90 €): RTX 4090 / RTX 5090, i9/Ryzen 9 CPUs with high TDP, extreme overclocking, dual-GPU builds or workstations

All four models share a fully modular design, allowing only the necessary cables to be connected to improve airflow in the case and simplify cable management. Additionally, there is a Zero RPM semi-passive mode, which keeps the fan off under light loads for virtually silent operation during normal PC use.