In the high-wattage PSU market, CORSAIR’s RM Series is a dominant force. When it comes to 1200W models, the confusion start about those, RM1200x or RM1200e are two popular choices for enthusiasts and builders with power-hungry components. Both promise top-tier performance, reliability, and efficiency. But with similar names and specs, which one should you choose for your next build? We’ll break down the key differences to help you decide which powerhouse PSU is the perfect fit.
Short Intro
Powering a high-end PC with components like the latest graphics cards and CPUs requires a robust and reliable power supply unit (PSU). The CORSAIR RM1200x vs RM1200e are both 1200W, 80 PLUS Gold-certified, fully modular PSUs.
The primary difference lies in their design philosophy and target audience. The RM1200x SHIFT is part of CORSAIR’s premium line, known for its unique side-mounted cable interface, which simplifies the building process and cable management.
The RM1200e, on the other hand, is a more traditional, value-oriented option that offers excellent performance without the premium features of its sibling.
Feature-by-Feature Comparison Table
| Feature | CORSAIR RM1200x SHIFT | CORSAIR RM1200e |
| Form Factor | ATX (longer chassis) | ATX (standard chassis) |
| Cable Interface | Side-mounted (SHIFT) | Rear-mounted (Traditional) |
| Efficiency Rating | 80 PLUS Gold, Cybenetics Gold | 80 PLUS Gold, Cybenetics Platinum |
| Capacitors | 100% Japanese 105°C | 100% Japanese 105°C |
| Fan | 140mm Fluid Dynamic Bearing (FDB) | 140mm Rifle Bearing |
| Casing Depth | 180mm | 150mm |
| Cables | Corsair Type 5, fully modular | Corsair Type 4, fully modular |
| Warranty | 10 years | 10 years |
| ATX 3.1 & PCIe 5.1 | Yes | Yes |
Quick Highlights Table
| Benchmark | RM1200x SHIFT | RM1200e |
| Cybenetics Efficiency | Gold | Platinum |
| Cybenetics Noise | A- | A+ |
| Fanless Mode | Yes (up to ~50% load) | Yes (up to ~50% load) |
| Load Regulation | Excellent | Excellent |
| Ripple & Noise | Very Low | Very Low |
Key Takeaways
- RM1200x SHIFT is designed for the ultimate builder’s convenience. Its standout feature is the side-mounted modular interface, which dramatically simplifies cable management, especially in cases with restricted space at the back of the PSU.
- The RM1200e is a slightly more efficient and quieter PSU, as indicated by its Cybenetics Platinum rating and A+ noise rating. It achieves this by using a different internal design and components.
- The RM1200e is more compact, with a standard 150mm depth, making it compatible with a wider range of cases, including smaller form factor builds. The RM1200x’s 180mm depth may not fit all cases.
Pros & Cons of RM1200x or RM1200e
CORSAIR RM1200x SHIFT
Pros:
- Revolutionary cable management: The side-mounted connectors make building and upgrading a breeze.
- Premium build quality: Top-tier components for exceptional reliability.
- Long 10-year warranty: Peace of mind for a decade.
Cons:
- Requires a specific case: The longer chassis and side cables may not fit in all cases, especially older or smaller ones.
- Higher price point: The unique design comes at a premium.
CORSAIR RM1200e
Pros:
- Excellent value: Offers high performance and 1200W capacity at a more accessible price.
- Superior efficiency & low noise: Its Cybenetics Platinum rating makes it one of the quietest and most efficient PSUs in its class.
- Compact size: Fits into a wider variety of cases due to its standard 150mm depth.
Cons:
- Traditional cable interface: Cable management can be more challenging compared to the SHIFT model.
- Fewer cable connectors: The RM1200e offers fewer total connectors than the RM1200x.
Buying Recommendations
- Choose the RM1200x SHIFT if: You’re building a new PC and want the easiest and cleanest cable management possible. You have a case that is confirmed to be compatible with its 180mm depth and side-mounted connectors. You don’t mind paying a little extra for a premium, user-friendly experience.
- Choose the RM1200e if: You are on a tighter budget but still need a high-quality, high-wattage PSU. You prioritize maximum efficiency and quiet operation. You have a smaller or more traditional PC case where the RM1200x SHIFT might not fit.
Final Verdict
Both the CORSAIR RM1200x SHIFT and the RM1200e are stellar power supplies that live up to the CORSAIR name. They are both fully modular, ATX 3.1 compliant, and backed by a 10-year warranty.
The RM1200x SHIFT is for the builder who values convenience and a flawless aesthetic. Its innovative design is a game-changer for cable management and is worth the premium if your case can accommodate it.
The RM1200e is the sensible, high-performance choice. It delivers the core functionality and reliability of a premium PSU at a more competitive price, all while being a touch more efficient and quieter. For most builders, the RM1200e is the better all-around value.
FAQ for RM1200x Vs RM1200e
Q1: What does “ATX 3.1” compliance mean?
Ans: ATX 3.1 is the latest power supply standard from Intel, designed to handle the massive power spikes (transient loads) of modern GPUs like the NVIDIA 40-series. This ensures stable performance and prevents system shutdowns under heavy load.
Q2: What’s the difference between a Fluid Dynamic Bearing (FDB) and a Rifle Bearing fan?
Ans: FDB fans generally offer superior longevity and quieter operation due to less friction compared to rifle bearings. While both are good, FDB is considered the more premium and durable option.
Q3: Is the RM1200e compatible with the NVIDIA RTX 4090?
Ans: Yes, the RM1200e is a 1200W PSU that is ATX 3.1 and PCIe 5.1 compliant. It comes with a native 12V-2×6 cable, making it fully compatible with high-power GPUs like the RTX 4090 without the need for adapters.
Q4: Which one is quieter?
Ans: The RM1200e is generally quieter. Based on Cybenetics testing, it holds an A+ noise rating, while the RM1200x SHIFT has an A- rating. Both have a Zero RPM fan mode for silent operation at low loads.
Q5: Can I use the cables from my old CORSAIR PSU with the new ones?
Ans: You should only use the cables that come with your new PSU. The RM1200x SHIFT uses Type 5 cables, while the RM1200e uses Type 4. Using incompatible cables can damage your components.
Q6: Why is the RM1200x SHIFT more expensive if the RM1200e is more efficient?
Ans: The price difference is primarily due to the unique SHIFT side-mounted modular interface, which is a significant design and manufacturing change. This feature is a premium convenience that adds to the overall cost, even if the RM1200e is slightly more efficient.
Conclusion
For a PC builder looking for the absolute best in cable management convenience, the CORSAIR RM1200x SHIFT is an innovative and premium choice that truly streamlines the building process. However, if your main priorities are price, efficiency, and broad case compatibility, the CORSAIR RM1200e offers an incredible amount of power and top-tier performance for a more accessible price. Both are excellent choices, but the RM1200e is arguably the superior value for the majority of users.
If you have any questions about “Corsair RM1200x Vs RM1200e: Which 1200W PSU Is Right for You?” Then feel free and let us know through your comments.
