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Corsair RMx Series RM1000x Fully Modular Power Supply vs MSI MAG A850GL PCIE5

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 MSI MAG A850GL PCIE5 at 6.3/10.

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

They score the same on cabling and connectors and noise.

The biggest difference is warranty, where the Corsair RMx Series RM1000x Fully Modular Power Supply scores 10/10 to the MSI MAG A850GL PCIE5's 5/10.

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

MSI MAG A850GL PCIE5

MSI MAG A850GL PCIE5

6.3/10verdict: good, not the best

The MSI MAG A850GL PCIE5 suits builders putting together a modern gaming PC who want a fully modular 850W Gold supply with a native 16-pin cable. It fits those who value cable management, quiet running under load and PCIe 5 support. It is less suited to always-on machines that idle at very low loads.

Typically about £89.99 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 RMx Series RM1000x Fully Modular Power SupplyMSI MAG A850GL PCIE5
Quality and protections30%7/106/10
Efficiency20%8/106/10
Cabling and connectors20%8/108/10
Noise15%6/106/10
Warranty15%10/105/10
Overall7.7/106.3/10

Specifications

SpecCorsair RMx Series RM1000x Fully Modular Power SupplyMSI MAG A850GL PCIE5
Rated output (W)1000W continuous850W rated output
Efficiency rating (80 Plus or Cybenetics)Measured Cybenetics Platinum: 89-91% at 115V, 91-93% at 230V (Hardware Busters)80 PLUS Gold, up to 90%
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATX, 160x150x86 mm (Corsair); 150x85x160 mm (Hardware Busters)ATX
Modular cabling (fully, semi or non-modular)Fully modular, Type-4 cablesYes, full modular
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)1x PCIe 12V-2x6 (12+4), 4x PCIe 8-pin (6+2), 2x EPS 8-pin, 12x SATA, 6x PATA1 x PCI-E 5.0 16-pin rated 600W, 4 x PCI-E 6+2 pin, 8 x SATA, 4 x peripheral (Molex), 1 x FDD, 2 x EPS 4+4, 1 x ATX 24-pin
Fan size and zero-fan mode1x 140mm fluid dynamic bearing fan with Zero RPM mode and manual override knob120mm fluid dynamic bearing fan
Warranty (years)10 yearsnot listed

Strengths and weaknesses

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 ›

MSI MAG A850GL PCIE5

  • + Native 600W 16-pin cable included
  • + Fully modular with plenty of PCIe and SATA connectors
  • + Six listed protections on a CWT GPX platform
  • − Efficiency reported below 70% at 2% load
  • − 3.3V OCP trigger set too high, per Hardware Busters
  • − Some owners report fan noise or faults after months

Skip it if:

  • Buyers building an always-on PC that idles at very low load.
  • Anyone fitting a small case who wants flexible, easy-to-route flat cables.
  • Buyers who want the strictest overcurrent protection on the 3.3V rail.
Read the full MSI MAG A850GL PCIE5 review ›

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