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Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply vs Corsair RMe Series RM850e

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

all judged against power supplies at a similar price

The Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply scores 7.2/10 overall, ahead of the Corsair RMe Series RM850e at 7.0/10.

The Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply leads on efficiency.

The Corsair RMe Series RM850e leads on noise.

They score the same on quality and protections, cabling and connectors and warranty.

Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply

Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply

7.2/10verdict: good, not the best

The RM1000e suits builders who want a 1000W ATX 3.1 power supply for a modern high-end graphics card. It fits people who care about low noise at everyday loads and want a native 12V-2x6 cable in the box. It is less suited to buyers who want premium internal components or a generous cable bundle.

Typically about £119.99 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 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

Scores, criterion by criterion

CriterionWeightCorsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power SupplyCorsair RMe Series RM850e
Quality and protections30%7/107/10
Efficiency20%8/106/10
Cabling and connectors20%7/107/10
Noise15%7/108/10
Warranty15%7/107/10
Overall7.2/107.0/10

Specifications

SpecCorsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power SupplyCorsair RMe Series RM850e
Rated output (W)1000 W rated continuous output; +12V rail 83.3 A; +3.3V and +5V 150 W each; +5VSB 15 W850W
Efficiency rating (80 Plus or Cybenetics)80 PLUS Gold and Cybenetics Gold per Corsair; Hardware Busters measured Cybenetics Platinum (89.483% at 115 V, 91.576% at 230 V)Cybenetics Gold
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATX, 140 x 150 x 86 mm; ATX 3.1 certified; PCIe 5.1 compliantATX
Modular cabling (fully, semi or non-modular)Fully modularFully modular
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)One native 12V-2x6 cable included; 1x 24-pin ATX, 2x EPS 8-pin, 7x SATA, 4x PATA; PCIe 8-pin count disputed across sources (2 to 6)2 x PCIe 8-pin (6+2), 1 x 12V-2x6, 2 x EPS
Fan size and zero-fan mode120 mm rifle-bearing fan with zero-RPM mode (fan off at low and moderate loads, per Corsair)120mm rifle-bearing fan
Warranty (years)7 years7 years

Strengths and weaknesses

Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply

  • + Native 12V-2x6 cable and fully modular design
  • + Tight regulation, low ripple and working protections
  • + Quiet at low and moderate loads with zero-RPM mode
  • − Second-tier capacitors and MOSFETs, per Tom's Hardware
  • − Owners describe the cable bundle as minimal
  • − Owners question value against Corsair's own models

Skip it if:

  • Buyers who want premium-brand capacitors and MOSFETs inside the unit
  • Builders needing a large cable bundle for many drives or accessories
  • Anyone who wants ten-year warranty cover
Read the full Corsair RM1000e (2025) RMe Series Fully Modular ATX 3.1 Power Supply review ›

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 ›

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