Corsair rmx 2018 850 w

Corsair rmx 2018 850 w DEFAULT

corsair Logo Corsair Corsair RM850x 850 Watt 80 Plus Gold ATX Fully Modular Power Supply 2018

Corsair RMx series power supplies give you extremely tight voltage control, quiet operation, Gold-certified efficiency, and a fully modular cable set. Built with all Japanese 105C capacitors, theyre a great choice for high performance PCs where reliability is essential. 80 PLUS Gold efficiency reduces operating cost and excess heat, and Zero RPM fan mode ensures virtual silence at low and medium loads. And, the fully modular DC cables make builds and upgrades easy, with clean, great-looking results.


CORSAIR RMx Series RM850X 850W 80 PLUS GOLD Haswell Ready Full Modular ATX12V & EPS12V SLI and Crossfire Ready Power Supply

Pros: This is an update to my earlier review, after having done more research on this model and its slightly more expensive sibling, the Corsair RM850i. I discovered that the reason for the bulky 24-pin, EPS (CPU) and PCI-e cables is that they include capacitors near the connector ends for enhanced ripple suppression. With flat cables, including and/or hiding them would probably be more difficult than using traditional round braided cables. These capacitors are hidden under a length of heatshrink which encloses the end of the braided section, with a slight bulge revealing their location. While their inclusion makes for less attractive cables, it apparently does wonders for ripple suppression, as when I looked at reviews and charts on various sites like Toms Hardware, the RMx series beat many other competitors by quite a margin. I also found out that CableMod supplies custom cables for this model - these move the capacitors further back towards the PSU so they can be hidden behind the motherboard area.

Cons: My previous complaint regarding heat still stands, and some reviews of the RM850i mention that that model also gets quite warm. However, the RM850i is Corsair Link compatible, and its fan can be controlled by software, unlike the RM850X. It also has a fan test button, plus a better fan bearing (Fluid Dynamic Bearing vs Rifle Bearing).

Overall Review: I am raising my rating by one egg after having seen third party tests of this PSU's excellent efficiency and performance, and internal build quality with all-Japanese capacitors. I am still not happy with the heat generation though, and as Tom's Hardware noted (for the RM750X, but the same applies here), a switch to allow normal fan operation would have been nice -- the fan is very quiet anyway -- instead of always being in semi-passive mode. I discounted not having Corsair Link compatibility as a minor point in my previous review, but was then unaware that the fan speed could be controlled in addition to fan and power monitoring. In a well-ventilated case that can exhaust heat well, this may not be an issue -- aside from the (lack of) digital interface and fan bearing, it is identical to the RM850i -- so you could save a few dollars with this model as overall performance is the same. My main build is in an NZXT H440, which is quiet, but only middling in terms of ventilation, and the RM850X would get really hot inside that case's PSU shroud. As I mentioned in my previous review, the unit I received would only briefly spin up the fan even at 54% output load. In my situation the RM850i would be preferable, due to its fan/power monitoring and fan control via Corsair Link (the current revision works really well compared to early releases). Note: I received the Corsair RM850X from Newegg for the purposes of my review(s).

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Features & Specifications

Corsair is a key player in the PSU market, battling EVGA for first place in U.S. sales. One of the company's most recognizable and popular power supply families is the RMx, with all of its models offering plenty of value and quiet operation. The RMx line-up has already been around for more than three years though, and given EVGA's newer G3 series, it was time for Corsair to strike back.

It seems like Corsair prefers to upgrade its PSUs quietly, implementing improvements without model number modifications. That's why the revised RMx units are named like their predecessors. We add the "V2" for purposes of differentiation.

At least for now, there are four new RMx models with capacities ranging from 550W to 850W. The biggest differences are apparent on the two higher-capacity PSUs, which are 20mm shorter than they were before. This makes them easier to install, particularly in smaller cases. Another notable addition is the RM750x V2's second EPS connector. The previous-gen version only had one. And in our opinion, the RM650x should have two EPS connectors as well. The RM850x V2 we're evaluating today costs $120 and offers exceptional performance, plus ultra-quiet operation.

Since the RM850x is the V2 family's current flagship, that's the model we'll review first. It's manufactured by Channel Well Technology, and we see no reason for Corsair to look elsewhere since CWT does such a good job. With that said, we're sure many enthusiasts would be happy to see the OEM refresh this platform's aesthetics, if only because the current design is starting to look a bit dated.

The RM850x V2 features 80 PLUS Gold and ETA-A efficiency certifications, along with Cybenetics' LAMBDA-A+ noise rating. On paper, those are identical to Corsair's previous-generation RM850x. But the V2 model does output around 3 dB(A) less noise overall. This is because the original RM850x landed right on the line between LAMBDA-A+ and LAMBDA-A, while the RM850x V2 is close to the lower threshold of LAMBDA-A+.

As we'd expect, all necessary protection features are present. Moreover, the RM850x V2's maximum operating temperature for continuous full load operation is set at 50°C, per the ATX specification's recommendation.

When it comes to cooling, we find the same fan used on previous-generation models. The NR135L uses a rifle bearing, which is an enhanced version of the sleeve bearing that costs less than higher-end FDB/HDB-based solutions.

Power Specifications

Max. PowerAmps252570.830.8
Total Max. Power (W)850

The minor rails are overkill by today's standards, given their 150W maximum combined power. Fortunately, the +12V rail, which is what matters most in a modern PSU, can deliver the RM850x V2's full capacity on its own. Finally, the 5VSB rail offers 3A maximum current output.

Cables & Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600mm)1118-20AWGYes
4+4 pin EPS12V (650mm)2218AWGYes
6+2 pin PCIe (600mm+150mm) 3618AWGYes
SATA (500mm+110mm+110mm+110mm)1418AWGNo
SATA (520mm+110mm+110mm)2618AWGNo
Four-pin Molex (450mm+100mm+100mm+100mm)2818AWGNo
FDD Adapter (+100mm)1120AWGNo
AC Power Cord (1430mm) - C13 coupler1116AWG-

Corsair gives us two EPS connectors and six PCIe ones. That's enough to support a potent workstation with a high-end CPU and multiple graphics cards.

Peripheral connectivity is copious as well. We don't usually encounter eight four-pin Molex connectors, even in larger-capacity PSUs. Although the distance between PCIe connectors is good, we can't say the same for the peripheral connectors. A mere 10-11cm between them isn't enough in many enclosures. Usually, components fed by four-pin Molex connectors (like case fans) are installed far away from each other. The same goes for some hard drives and SSDs. That's why we want to see at least 15cm between all peripheral connectors.

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The RM850 V2's cables are shown in the photos above.

Power Distribution

Since this PSU features a single +12V rail, we do not have anything to say about its power distribution.


Manufacturer (OEM)CWT
Max. DC Output850W
Efficiency80 PLUS Gold, ETA-A
Modular✓ (Fully)
Intel C6/C7 Power State Support
Operating Temperature (Continuous Full Load)0 - 50°C
Over Voltage Protection
Under Voltage Protection
Over Power Protection
Over Current (+12V) Protection
Over Temperature Protection
Short Circuit Protection
Surge Protection
Inrush Current Protection
Fan Failure Protection
No Load Operation
Cooling135mm Rifle Bearing Fan (NR135L)
Semi-Passive Operation
Dimensions (WxHxD)150 x 86 x 162mm
Weight1.66kg (3.66lb)
Form FactorATX12V v2.4, EPS 2.92
Warranty10 Years

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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.
Corsair RM750X RMx 2018 Update

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2018 850 w corsair rmx

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Corsair RM 850x - 850 Watt 80+ Gold Power Supply - Review

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