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Corsair RMe Series RM850e vs Corsair RMx Series RM1000x Fully Modular Power Supply

Researched, not hands-on tested.How we review ›

all judged against power supplies at a similar price

The Corsair RMx Series RM1000x Fully Modular Power Supply scores 7.7/10 overall, ahead of the Corsair RMe Series RM850e at 7.0/10.

The Corsair RMe Series RM850e leads on noise.

The Corsair RMx Series RM1000x Fully Modular Power Supply leads on efficiency, cabling and connectors and warranty.

They score the same on quality and protections.

The biggest difference is warranty, where the Corsair RMx Series RM1000x Fully Modular Power Supply scores 10/10 to the Corsair RMe Series RM850e's 7/10.

Corsair RMe Series RM850e

Corsair RMe Series RM850e

7.0/10verdict: good, not the best

The Corsair RM850e is an 850W ATX power supply for people building or upgrading a quiet desktop or workstation. It suits buyers who want a fully modular unit with a native 12V-2x6 cable and a seven-year warranty. It is less suited to builds that need many PCIe 8-pin cables or a low-load, always-on setup.

Typically about £94.99 in the UK when we researched itSearch Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Corsair RMx Series RM1000x Fully Modular Power Supply

Corsair RMx Series RM1000x Fully Modular Power Supply

7.7/10verdict: buy

The Corsair RM1000x suits builders putting a high-power graphics card into a new ATX system. It also fits drive-heavy workstations and homelab machines that need many SATA connectors. It is a fully modular 1000W unit with a 10-year warranty and a native 12V-2x6 connector.

Typically about £130 in the UK when we researched itSearch Amazon UK (opens in a new tab, affiliate link)

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Scores, criterion by criterion

CriterionWeightCorsair RMe Series RM850eCorsair RMx Series RM1000x Fully Modular Power Supply
Quality and protections30%7/107/10
Efficiency20%6/108/10
Cabling and connectors20%7/108/10
Noise15%8/106/10
Warranty15%7/1010/10
Overall7.0/107.7/10

Specifications

SpecCorsair RMe Series RM850eCorsair RMx Series RM1000x Fully Modular Power Supply
Rated output (W)850W1000W continuous
Efficiency rating (80 Plus or Cybenetics)Cybenetics GoldMeasured Cybenetics Platinum: 89-91% at 115V, 91-93% at 230V (Hardware Busters)
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATXATX, 160x150x86 mm (Corsair); 150x85x160 mm (Hardware Busters)
Modular cabling (fully, semi or non-modular)Fully modularFully modular, Type-4 cables
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)2 x PCIe 8-pin (6+2), 1 x 12V-2x6, 2 x EPS1x PCIe 12V-2x6 (12+4), 4x PCIe 8-pin (6+2), 2x EPS 8-pin, 12x SATA, 6x PATA
Fan size and zero-fan mode120mm rifle-bearing fan1x 140mm fluid dynamic bearing fan with Zero RPM mode and manual override knob
Warranty (years)7 years10 years

Strengths and weaknesses

Corsair RMe Series RM850e

  • + Quiet: 22.81 dBA average and consistent owner praise
  • + Fully modular with a native 12V-2x6 cable
  • + Ripple and regulation measured well by independent reviewers
  • − Only two PCIe 8-pin connectors
  • − Efficiency drops below 70% at 2% load, owners report
  • − Standard cable has no OTP; owners report 3.3V droop

Skip it if:

  • Builders who need more than two PCIe 8-pin connectors for multiple GPUs.
  • Buyers running a near-idle, always-on machine where efficiency at 2% load matters.
  • Anyone who wants over-temperature protection on the standard cable.
Read the full Corsair RMe Series RM850e review ›

Corsair RMx Series RM1000x Fully Modular Power Supply

  • + 10-year warranty
  • + Native 12V-2x6 plus four PCIe 8-pin and 12 SATA
  • + Platinum-level efficiency measured on 230V
  • − Light-load efficiency is modest, about 74% at 20W
  • − Some owners report scratchy fan noise near full speed
  • − Some owners say the fan runs at full speed at desktop

Skip it if:

  • Buyers building a low-power always-on box who want high efficiency at very light loads
  • Buyers who need an utterly silent system and are bothered by reports of fan noise
  • Buyers with a small chassis that cannot take a roughly 160 mm deep ATX unit
Read the full Corsair RMx Series RM1000x Fully Modular Power Supply review ›

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