CORSAIR RM1200e (2023) Fully Modular Low-Noise ATX Power Supply with 12V-2x6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Platinum Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
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A 1200-watt, fully modular ATX 3.1 and PCIe 5.1 compliant power supply for high-end PC builds needing stable power and a 12V-2x6 cable.
This 1200-watt, ATX 3.1 and PCIe 5.1 compliant power supply with a 12V-2x6 cable is a strong fit for users building or upgrading high-performance PCs. Its fully modular design simplifies cable management, and the Cybenetics Platinum efficiency helps manage power consumption. The 10-year warranty provides extended peace of mind for its 105°C-rated capacitors.
If 1200 watts is excessive for your build, consider a lower wattage ATX 3.1 PSU with Cybenetics Platinum or Gold efficiency to save money and potentially improve efficiency at lower loads.
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Pros
- Delivers 1200 watts of power, suitable for demanding components like NVIDIA RTX 40-series GPUs.
- Features full modularity, allowing you to connect only the necessary cables for a cleaner build.
- Complies with ATX 3.1 and PCIe 5.1 standards, including a native 12V-2x6 cable for modern graphics cards.
- Achieves Cybenetics Platinum efficiency and 80 PLUS Gold certification, providing up to 90% efficiency.
- Operates with a 140mm rifle bearing fan that includes a Zero RPM mode for near-silent operation at lower loads.
- Backed by a ten-year warranty, covering the unit's industrial-grade 105°C-rated capacitors.
Cons
- Some users report coil whine, particularly at low power loads, which can be a recurring issue even with replacement units.
- The main motherboard power cable is described as stiff, making it difficult to bend and manage in some cases.
- Does not include premium sleeved cables, which some users expect at this price point.
- A critical review suggests the use of second-tier Taiwanese Teapo capacitors on the primary side, despite claims of 100% Japanese capacitors.
Dimension Scores
The 1200-watt output combined with Cybenetics Platinum and 80 PLUS Gold efficiency, reaching up to 90%, places it at the high end for power delivery and energy conservation.
The 140mm rifle bearing fan with Zero RPM mode ensures silent operation at low loads, though some users report coil whine under specific conditions.
It features industrial-grade, 105°C-rated capacitors and a robust resonant LLC topology with DC-DC conversion, but a critical review questions the origin of some internal components.
Full modularity allows for connecting only essential cables, significantly reducing clutter, though the main motherboard cable is reported as stiff.
Best For
- High-end gaming PCs with power-hungry GPUs like the RTX 4090.
- Workstations running multiple GPUs or high-TDP processors.
- Future-proofing a system with ATX 3.1 and PCIe 5.1 compliance for upcoming hardware.
- PC builders who prioritize minimal cable clutter due to its fully modular design.
Not Recommended For
- Budget-conscious builds where 1200 watts is significantly more than required.
- Users highly sensitive to potential coil whine, especially in quiet environments.
- Compact ITX builds, as its ATX form factor might be too large.
Watch Out For
- Coil whine has been reported by users, especially during low-load operation, which some find distracting.
- The 24-pin motherboard cable is notably stiff, making routing and connection challenging in some chassis.
- Despite official specifications, one critical review claims the PSU uses HEC manufacturing and Teapo capacitors on the primary side, raising questions about component quality.
- The 1200-watt capacity is often overkill for systems not running top-tier GPUs, leading to unnecessary expense.
Full Specifications
| ASIN | B0DXVPBJJ2 |
| Brand | Corsair |
| Color | Black |
| Series | CORSAIR RM1200e |
| Wattage | 1200 watts |
| Model Name | CORSAIR RM1200e |
| Form Factor | SFX12V |
| Item Weight | 4 pounds |
| Manufacturer | Corsair |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 1200 Watts |
| Item model number | CP-9020258-NA |
| Compatible Devices | Monitor |
| Product Dimensions | 5.91 x 5.91 x 3.39 inches |
| Item Dimensions LxWxH | 5.91 x 5.91 x 3.39 inches |
| Item dimensions L x W x H | 5.91 x 5.91 x 3.39 inches |
What Buyers Say
The CORSAIR RM1200e (2023) is a powerful PSU, but a recurring complaint about coil whine, especially at low loads, is a significant concern for some users, even leading to reports of identical issues with replacement units. While praised for its stable power delivery and tight voltage regulation within 1%, a critical review also raised questions about the use of second-tier internal components despite official claims of 100% Japanese capacitors. The stiff 24-pin motherboard cable also makes routing a bit of a hassle for some builders.
“Man, this thing powers my 4090 no problem, but that high-pitched whine when I'm just browsing is driving me nuts, thought a 1200w would be silent.”
Common Praise
- Provides stable power delivery with voltage regulation within 1%.
- Operates quietly with its Zero RPM fan mode during light use.
- Fully modular design simplifies the building process and reduces cable clutter.
- Includes a native 12V-2x6 cable for modern, high-power GPUs.
- Its compact 150mm casing fits easily into most ATX power supply compartments.
Common Complaints
- Users frequently report coil whine, particularly when the system is under low load.
- The 24-pin motherboard cable is stiff and challenging to bend for clean cable routing.
- Some users are disappointed by the absence of premium sleeved cables.
- A critical review suggests the use of non-premium capacitors on the primary side, contradicting official specifications.
Ownership Tips
- The Zero RPM fan mode works as advertised, keeping the PSU silent until a certain load threshold is met.
- The included 12V-2x6 cable feels robust and connects securely to modern GPUs.
- Cable stiffness, especially the main ATX cable, can make initial installation and routing more time-consuming than expected.
- The compact 150mm depth does provide more space in smaller cases, which is a plus for cable management.
Frequently Asked Questions
Is this power supply compatible with NVIDIA RTX 40-series graphics cards?
Yes, it is ATX 3.1 and PCIe 5.1 compliant and includes a native 12V-2x6 cable, making it compatible with modern graphics cards like the RTX 40-series.
How quiet is the CORSAIR RM1200e?
It features a 140mm rifle bearing fan with a Zero RPM mode, meaning the fan stops spinning under low loads for near-silent operation. However, some users have reported coil whine under certain conditions.
What is the efficiency rating of this power supply?
The RM1200e is Cybenetics Platinum certified and 80 PLUS Gold certified, offering up to 90% power efficiency.
Does this PSU come with all necessary cables?
Yes, it's fully modular, so you only connect the cables your system needs. It includes a 12V-2x6 cable for modern GPUs, along with standard ATX, EPS, PCIe, SATA, and PATA connectors.
What is the warranty period for this power supply?
Corsair provides a ten-year warranty for the RM1200e.
Buying Guide
When you're looking at power supplies, you're basically picking the heart of your PC. You need enough wattage to power all your components, especially your graphics card. Efficiency ratings like Cybenetics Platinum tell you how much power is wasted as heat, so higher is better for your electricity bill and less heat inside your case. Modularity means fewer unused cables cluttering up your build, which helps with airflow and looks cleaner.
Wattage (1200 watts)
This is the total power your PSU can deliver. Think of it like the horsepower of a car; you need enough to move your system, especially if you have a powerful graphics card or CPU. Too little, and your system won't run stably; too much, and you're paying for unused capacity.
ATX 3.1 & PCIe 5.1 Compliant
This means the power supply is built to handle the latest generation of graphics cards and motherboards. It's like having the right plug for a new appliance; without it, you might need adapters or risk instability with high-power components.
Fully Modular
This refers to the cables. Fully modular means you only plug in the cables you actually need for your components. It's like having custom-length cables for everything, making your PC interior much tidier and improving airflow compared to having a bunch of unused cables bundled up.
Cybenetics Platinum Efficiency
This rating indicates how efficiently the power supply converts wall power into usable PC power. Platinum means it's very efficient, wasting less energy as heat. This saves you a bit on your electricity bill and keeps your PC cooler, which can extend component lifespan.
Alternatives
If this PSU doesn't fit, look for ATX 3.1 compliant power supplies with a lower wattage (e.g., 850W or 1000W) if your components don't demand 1200W, or consider units with a fluid dynamic bearing fan if absolute silence is your top priority and you want to minimize coil whine risk.
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