Corsair RM1000x Shift (2025) PSU Review

1. Introduction2. Bundle & Cabling3. External4. Internal5. Testing Methodology and Results6. Closing Thoughts7. View All Pages

Today we look at another power supply from Corsair, this time from the company's new RMx Shift range. Corsair have three models in this series – 750W, 850W and 1000W, with this review focused on the latter unit. The new ‘Shift' branding signifies side mounted connectors for easier access when inside a system.

These new Shift power supplies have ATX 3.1/PCIe 5.1 support for the latest graphics cards with a 12V-2×6 cable and debossed PVC cables with low profile cable combs. They also adopt a 140mm fluid dynamic bearing fan which supports Zero Fan Mode with a fan speed knob on the rear to allow for user control. More on this later.

Key Features:

• Innovative Easy Access Connection Position: Modular connections on the side of the PSU mean easier access for cables and cleaner cable management.
• Native 12v-2×6 Cable: Easily power modern graphics cards such as the Nvidia RTX50 series.
• Fully Modular connectors: Corsair Type S PSU cables are smaller, giving you plenty of room to route your cables, while their modularity ensures you only connect what you need.
• Cybenetics Gold Certified Efficiency rating.
• Debossed PVC Cable Kit: Ultra flexible cable kit with new included low profile combs.
• 140mm Fluid Dynamic Bearing Fan: Utilises a specially calculated fan curve for high performance, low noise, and superior reliability.
• Zero RPM Mode Support: At low and medium loads the cooling fan switches off entirely for near silent operation.
• Fan Speed Knob: Users have freedom to adjust the fan speed to their own needs.
• Intel ATX 3.1 Certified. Compliant with the ATX 3.1 power standard, supporting the PCIe Gen 5.1 platform and resisting transient power spikes.
• 105c Rated 100% Japanese Capacitors: Premium internal components deliver unwavering power delivery and long term reliability.
• Modern Standby Compatible: Extremely fast wake from sleep times and better low load efficiency.
• Resonant LLC Topology with DC-to-DC Conversion: Provides clean, consistent power and enables use of more energy-efficient sleep states.
• Ten-Year Warranty: Your guarantee of reliable operation that will last across several system builds.

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