Corsair RM1200e ATX 3.1 Gold Fully Modular SMPS

The Corsair RM1200e is a 1200-watt fully modular power supply built on the RMe Series platform, targeting enthusiast and high-performance PC builds that demand stable, clean power delivery without compromise. Certified for the ATX 3.1 standard, it meets the latest specification requirements for power delivery consistency, transient load handling, and timing precision — requirements that have become critical with modern CPUs and discrete GPUs drawing increasingly dynamic workloads. At its core the RM1200e uses a resonant LLC topology paired with DC-DC conversion stages, a design choice that reduces switching losses and produces tighter voltage regulation across the 12V, 5V, and 3.3V rails. Every capacitor inside is an industrial-grade Japanese electrolytic unit rated to 105°C, chosen for longevity and thermal resilience rather than cost alone. Corsair also confirms Cybenetics certification on this unit, an independent testing programme that validates real-world efficiency, acoustic output, and thermal performance beyond what the standard 80 PLUS Gold badge alone captures. The RM1200e ships with a PCIe 5.1-compliant 12V-2x6 GPU cable, making it ready for NVIDIA GeForce RTX 50 Series graphics cards and other current-generation adapters without requiring an aftermarket cable. The fully modular cable system — built on a Type 4 connector scheme with five universal 8-pin ports — means you attach only what your build actually needs, reducing airflow obstruction and simplifying cable management in both compact and full-tower chassis. Acoustics are addressed through a Zero RPM fan mode that keeps the fan stationary at lighter loads, producing near-silent operation during everyday tasks or when the system is idling. The unit also supports Modern Standby, enabling fast wake- sleep transitions and improved low-load efficiency for systems that use this power state. Verified Specifications: - Continuous output power: 1200 W - 80 PLUS certification: Gold - ATX standard: ATX 3.1 certified - PCIe connector standard: PCIe 5.1 (12V-2x6 cable included) - Modular type: Fully Modular (Type 4 cables) - ATX main connector: 1 × 24-pin - ATX12V connector version: 3.0 - PCIe 6+2-pin connectors: 2 - SATA connectors: 3 - Peripheral (4-pin) connectors: 4 - Capacitor rating: 105°C industrial-grade Japanese electrolytic - Zero RPM fan mode: Yes - Modern Standby support: Yes - MTBF: 100,000 hours - Warranty: 10 years - SKU: CP-9020258-IN