Corsair RM Series 850 W Review 0

Corsair RM Series 850 W Review

Packaging, Contents & Exterior »


Corsair RM850 Features & Specs
Max. DC Output850W
Efficiency80 PLUS Gold
Intel Haswell ReadyYes
Operating temperature0°C - 40°C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling135 mm Fan (NR135L)
Semi-passive operationYes
Dimensions150 mm (W) x 86 mm (H) x 180 mm (D)
Weight2.2 kg
ComplianceATX12V v2.4, EPS 2.92
Warranty5 years
Price at time of review (exc. VAT)$149.99

Efficiency is 80 Plus Gold, and the unit is compatible with the newest ATX 2.4 spec (or 1.31 revision), which brings several updates over the previous version. All ATX 2.4 PSU are normally also Haswell ready, supporting the new sleep states Intel introduced with Haswell.

The RM850 has all protection features, including OTP (Over Temperature Protection), which is essential in semi-passive units, especially if their maximum operating temperature is only 40°C. We find it pretty strange that Corsair rated their new RM units at only 40°C since all RM units feature a semi-passive operation, which will inevitably lead to increased operational temperatures.

At 18 cm long, the RM850's dimensions are quite large. However, most chassis will accommodate it without a problem. Its warranty is long enough at five years, and the price Corsair asks for the unit looks pretty nice if we take its specifications and features into account.

Corsair RM850Power Specs
Max. Power25A25A70.8A3A0.8A
Total Max. Power850W

There is only one +12V rail. It can deliver the unit's full power if needed. The minor rails are very strong with 150 W maximum combined power, and the 5VSB rail has the typical current output for a unit of this capacity.

Cables & Connectors, Power Distribution

Modular Cables
ATX connector (610mm)20+4 pin
4+4 pin EPS12V (650mm)2
6+2 pin PCIe (600mm+150mm) 6
SATA (540mm+90mm+90mm+90mm)4
SATA (500mm+90mm+90mm)6
4 pin Molex (450mm+100mm+100mm+100mm)8
FDD adapter (+100mm)2
Corsair Link (800mm)1

This unit is equipped with an adequate number of cables. You have two EPS and six PCIe connectors at your disposal, and you can connect numerous drives and peripheral devices to its SATA and peripheral connectors. Cable length is also good; however, we would like the 4-pin Molex connectors to be spaced apart further, at least 13-15 cm. The Corsair Link cable has two headers that connect to the Corsair Link system sold separately; and it allows the PSU to connect with a USB header on the mainboard. All cables are 18AWG, which is the size the ATX spec recommends.

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