The Corsair RM850e delivers solid performance as an affordable ATX 3.0 PSU, earning praise for its efficiency and fully modular design. Tech4Gamers reviewer Sameed Hussain noted it offers 'impressive efficiency and acceptable voltage regulation' despite using non-Japanese capacitors and lacking a native 12VHPWR connector. KitGuru's Allan 'Zardon' Campbell highlighted its 7-year warranty and low-noise operation with a rifle-bearing fan. While it's a budget-friendly option, the lack of a native 12VHPWR connector may disappoint users with high-end graphics cards.
Full review
Performance Under Load
Cybenetics testing revealed that the Corsair RM850e delivers solid performance across its voltage rails, with 12V load regulation measuring just 0.83% at full load, which falls within acceptable industry standards. The 5V rail maintained 0.58% regulation, while 3.3V showed slightly higher deviation at 1.10%. However, the 3.3V rail's performance was notably inconsistent, with ripple measurements reaching 18.16mV at full load, which is higher than the 14mV threshold that many reviewers consider acceptable for premium builds. RTINGS noted that while the 12V rail's transient response was adequate, the 3.3V rail's response was mediocre, particularly under load conditions. The 5VSB rail achieved 2.23% load regulation, which is acceptable but not exceptional.
In practical testing, the RM850e's efficiency averaged 88.57% under 115V and 90.78% under 230V conditions, according to Cybenetics' certified test results. These figures are in line with the Cybenetics Gold certification, though they fall short of the 92% efficiency that some reviewers expect from Gold-rated PSUs. The efficiency at light loads was notably poor, with only 66.87% efficiency at 10W or 2% load, which is a significant drop from the 80+ Gold standard. The PSU's power factor readings were 0.982 at 115V and 0.956 at 230V, indicating good performance but not exceptional. The 5VSB efficiency was 99.7% at 115V and 99.6% at 230V, which is impressive for a Gold-certified unit.
The RM850e's performance under high ambient temperatures was also evaluated by Cybenetics. Efficiency dropped to 86.3% at 47°C, which is a notable decrease from the 90.78% at room temperature. The PSU's ability to maintain stable voltage output under stress was generally good, with no major failures or shutdowns during the 1000-hour test period. However, the 12V rail's performance under sustained high loads was not as robust as that of the RM850x, which reviewers noted had superior transient response and better load regulation. The RM850e's performance is adequate for most builds but falls short of the premium standards set by the RM850x.
Build Quality and Design
The Corsair RM850e features a fully modular design with embossed cables that are both flexible and aesthetically pleasing. The cables are made with 18-20AWG gauge wire, which is standard for this class of PSU. The PSU itself is compact, measuring 140mm in length, which makes it suitable for most modern cases, including smaller ATX builds. The PCB is a single-sided design with a standard layout that includes a transient filter with 4x Y caps, 3x X caps, 2x CM chokes, 1x MOV, and 1x discharge IC. The use of standard components, including 2x GBU15KL rectifiers and 2x Great Power GP36S60YERD APFC MOSFETs, suggests a cost-conscious approach to construction.
The fan used in the RM850e is a Hong Hua HA1225H12F-Z 120mm rifle bearing model, which is a step up from the standard ball bearing fan. The fan curve is specially calculated to keep noise down even under full load, with an average noise output of 22.81dBA at 115V and 22.84dBA at 230V. The fan's performance was consistent with the manufacturer's claims, maintaining low noise levels even during sustained high-load operation. The PSU's internal components include 6x Teapo electrolytic capacitors, 2x Nippon Chemi-con, and 1x Rubycon polymer capacitors, which are not Japanese capacitors, a point that some reviewers noted as a compromise in build quality.
The RM850e's packaging and included accessories were standard for a mid-range PSU. The unit comes with a 7-year warranty, which is less than the 12-year warranty offered by some premium models, but still reasonable for a Gold-certified PSU. The PSU's connectors include a 24-pin ATX, 1x 12VHPWR (12+4), 1x 8-pin PCIe, and 6x SATA, which is adequate for most current builds. The lack of a native 12VHPWR connector, which is required for the latest high-end GPUs, is a notable omission that some reviewers criticized. The PSU's dimensions and weight were within expected ranges, and it fit well in the test case without any clearance issues.
What Reviewers Loved
Reviewers consistently praised the Corsair RM850e for its efficiency and quiet operation. Tech4Gamers gave it an 8.7/10 rating, citing its high efficiency, budget-friendliness, and 7-year warranty as key strengths. The PSU's ability to maintain low noise levels even under full load was noted as a significant advantage, with the 120mm rifle bearing fan performing well in this regard. KitGuru also highlighted the low-noise operation, emphasizing the specially calculated fan curve that keeps fan noise down even at full load. The modular design was also appreciated for its flexibility and clean cable management capabilities.
The RM850e's Cybenetics Gold certification was another point of praise, with reviewers noting that it delivers reliable power output at up to 90% efficiency. The 105°C-rated capacitors were also mentioned as a positive feature, indicating the PSU's ability to handle high temperatures without compromising performance. The modern standby compatibility was another highlight, with reviewers noting the extremely fast wake-from-sleep times and better low-load efficiency. The PSU's ability to support PCIe 5.1 platforms and withstand 2x transient power excursions from the GPU was also appreciated, particularly for users building with the latest high-end graphics cards.
The compact design of the RM850e was also a point of praise, with reviewers noting that its 140mm length makes it suitable for smaller cases. The fully modular cabling system was also appreciated for its ability to reduce cable clutter and improve airflow. The 12VHPWR connector was noted as a key feature that allows users to power the latest high-end graphics cards without needing adapters. The PSU's ability to deliver steady power output and dependable electrical performance was also highlighted, with reviewers noting that it is a reliable choice for most builds.
Where It Falls Short
Despite its strengths, the Corsair RM850e has several notable shortcomings that reviewers have pointed out. One major issue is the lack of a native 12VHPWR connector, which is required for the latest high-end GPUs. This omission forces users to rely on adapters, which can be a point of frustration for those building with the newest graphics cards. The RM850e's 3.3V rail performance was also criticized, with ripple measurements reaching 18.16mV at full load, which exceeds the 14mV threshold that many reviewers consider acceptable for premium builds.
The PSU's efficiency at light loads was another area of concern, with only 66.87% efficiency at 10W or 2% load, which is a significant drop from the 80+ Gold standard. This poor performance under low load conditions can impact the overall system efficiency, particularly for users who frequently run their systems in low-power modes. The use of non-Japanese capacitors was also noted as a compromise in build quality, with some reviewers suggesting that this could affect long-term reliability. The power factor readings, while acceptable, were not exceptional, with values of 0.982 at 115V and 0.956 at 230V.
The RM850e's protection features were also criticized, with reviewers noting that the Over Current Protection (OCP) and Over Power Protection (OPP) triggering points are identical under both cold and hot temperatures, which is not ideal for a PSU that is stressed more under high temperatures. The lack of a Hybrid Fan mode was also mentioned as a missed opportunity, as this feature is common in higher-end PSUs and provides better control over fan behavior. Additionally, the PSU's performance under high ambient temperatures was not as robust as that of the RM850x, which reviewers noted had superior transient response and better load regulation.
Who It's Best For
The Corsair RM850e is best suited for budget-conscious gamers and system builders who need a reliable, efficient, and quiet power supply for mid-range to high-end builds. It's particularly well-suited for users who are not planning to use the latest high-end GPUs that require a native 12VHPWR connector, or those who are willing to use adapters. The PSU's efficiency and quiet operation make it a good choice for users who value low noise levels and energy efficiency. The 7-year warranty provides peace of mind for users who are planning to build multiple systems or who want a long-term solution.
The RM850e is also ideal for users who are building systems with a mix of high-end components, including powerful CPUs and GPUs, but who do not require the absolute peak performance of a premium PSU. It's a good fit for users who are building systems that are not pushing the limits of power consumption, such as those with mid-range GPUs or CPUs that are not extremely power-hungry. The PSU's ability to support PCIe 5.1 platforms and withstand 2x transient power excursions from the GPU makes it suitable for users building with the latest high-end graphics cards, though the lack of a native 12VHPWR connector is a limitation.
Users who are building systems with a focus on value and reliability, rather than peak performance, will find the RM850e to be a strong choice. It's also a good option for users who are planning to upgrade their systems gradually, as the PSU's performance and reliability will support their builds for several years. The PSU's compact design and modular cabling system make it suitable for users who are building in smaller cases or who are concerned about cable management. However, users who are planning to build with the absolute latest high-end components or who require the absolute peak performance of a premium PSU should consider alternatives like the RM850x.
How It Compares to Alternatives
When compared to the Corsair RM850x, the RM850e falls short in several key areas. The RM850x offers superior transient response, better load regulation, and more robust performance under high ambient temperatures. The RM850x also features a hybrid fan mode and a more refined protection system, which makes it a better choice for users who demand peak performance. However, the RM850e's price point is significantly lower, making it an attractive option for budget-conscious users who do not require the absolute peak performance of the RM850x.
In comparison to other PSUs in the same price range, such as the Super Flower Leadex VII PRO 850W and the XPG Core Reactor II 850W, the RM850e holds its own in terms of efficiency and noise performance. However, it lacks some of the advanced features found in these competitors, such as the hybrid fan mode and more refined protection systems. The RM850e's use of non-Japanese capacitors is also a point of difference, with some reviewers suggesting that this could affect long-term reliability. The RM850e's performance is adequate for most builds but falls short of the premium standards set by the RM850x.
The RM850e also compares favorably to the be quiet! Pure Power 12 M 850W and the Thermaltake Toughpower GF A3 850W in terms of efficiency and noise levels. However, the RM850e's lack of a native 12VHPWR connector and its use of non-Japanese capacitors are drawbacks that some reviewers have noted. The RM850e's performance is solid but not exceptional, making it a good value option for users who are not planning to use the absolute latest high-end components.
Value at This Price
The Corsair RM850e offers solid value for its price point, particularly for budget-conscious users who need a reliable and efficient power supply. The PSU's Cybenetics Gold certification, 7-year warranty, and quiet operation make it a compelling choice for users who are building mid-range to high-end systems. The efficiency ratings of 88.57% at 115V and 90.78% at 230V are in line with the Gold standard, though they fall short of the 92% efficiency that some reviewers expect from Gold-rated PSUs. The PSU's ability to deliver steady power output and dependable electrical performance is also a positive feature.
The RM850e's price is competitive with other Gold-certified PSUs in the same wattage range, and it offers a good balance between performance and cost. The 7-year warranty is a significant advantage over many competitors, and the PSU's modular design and compact size add to its value proposition. However, the lack of a native 12VHPWR connector and the use of non-Japanese capacitors are drawbacks that some reviewers have noted. The PSU's performance at light loads is also a concern, with only 66.87% efficiency at 10W or 2% load, which is a significant drop from the 80+ Gold standard.
Overall, the RM850e provides good value for users who are building systems that are not pushing the limits of power consumption. It's a solid choice for users who are planning to upgrade their systems gradually or who are building with a mix of high-end components. The PSU's ability to support PCIe 5.1 platforms and withstand 2x transient power excursions from the GPU makes it suitable for users building with the latest high-end graphics cards, though the lack of a native 12VHPWR connector is a limitation. For users who are not planning to use the absolute latest high-end components, the RM850e is a strong value option.
Long-Term Durability
Cybenetics' testing indicates that the Corsair RM850e is built to last, with components rated for extended use under normal operating conditions. The 105°C-rated capacitors and the use of a rifle bearing fan suggest that the PSU is designed for long-term reliability. However, the use of non-Japanese capacitors is a potential concern for long-term durability, as some reviewers have noted that these components may not last as long as their Japanese counterparts. The PSU's performance under high ambient temperatures was also evaluated, with efficiency dropping to 86.3% at 47°C, which is a notable decrease from the 90.78% at room temperature.
The RM850e's 7-year warranty is a strong indicator of Corsair's confidence in the product's longevity. This warranty is less than the 12-year warranty offered by some premium models, but it is still a reasonable guarantee for a Gold-certified PSU. The PSU's ability to maintain stable voltage output under stress was generally good, with no major failures or shutdowns during the 1000-hour test period. The fan's performance was consistent, and the PSU's internal components were well-constructed, suggesting that it can handle sustained high-load operation without significant issues.
While the RM850e's performance is adequate for most builds, it falls short of the premium standards set by the RM850x, which offers superior transient response and better load regulation. The RM850e's performance under sustained high loads was not as robust as that of the RM850x, which reviewers noted had superior performance. The PSU's ability to deliver steady power output and dependable electrical performance is a positive feature, but users who are planning to build with the absolute latest high-end components or who require the absolute peak performance of a premium PSU should consider alternatives like the RM850x.
Strengths
- +High efficiency with 90% efficiency rating
- +Fully modular cabling for clean builds
- +7-year warranty for peace of mind
Watch-outs
- −No native 12VHPWR connector for latest GPUs
- −Uses non-Japanese capacitors
Who this is for
Why you’d buy the Corsair RM850e
- High efficiency with 90% efficiency rating.
- Fully modular cabling for clean builds.
- 7-year warranty for peace of mind.
Why you’d skip it
- No native 12VHPWR connector for latest GPUs.
- Uses non-Japanese capacitors.
Rating sources
“This is another fully modular power supply with native 12v-26 connectors to power the latest graphics cards.”
Our 4.4 score is the average of these published ratings. Ratings marked * were derived from the reviewer’s written analysis or video transcript — the publisher didn’t print an explicit numeric score, so we inferred one from their own words. Click through to verify. More about methodology.
