Skip to content
sudopicks
esc

Corsair RMx Series RM1000x Fully Modular Power Supply vs NZXT C850 Gold ATX 3.1

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 NZXT C850 Gold ATX 3.1 at 6.7/10.

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

The NZXT C850 Gold ATX 3.1 leads on noise.

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

NZXT C850 Gold ATX 3.1

NZXT C850 Gold ATX 3.1

6.7/10verdict: good, not the best

The NZXT C850 Gold ATX 3.1 is an 850 W fully modular power supply for single-GPU builds. It suits buyers who want a native 12V-2x6 cable and a quiet fan at low and moderate loads. The 10-year warranty adds reassurance for a unit meant to stay in a case for a long time.

Typically about £110.74 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 SupplyNZXT C850 Gold ATX 3.1
Quality and protections30%7/105/10
Efficiency20%8/107/10
Cabling and connectors20%8/107/10
Noise15%6/107/10
Warranty15%10/109/10
Overall7.7/106.7/10

Specifications

SpecCorsair RMx Series RM1000x Fully Modular Power SupplyNZXT C850 Gold ATX 3.1
Rated output (W)1000W continuous850 W
Efficiency rating (80 Plus or Cybenetics)Measured Cybenetics Platinum: 89-91% at 115V, 91-93% at 230V (Hardware Busters)80 PLUS Gold and Cybenetics Gold; measured at 115 V: 85.8% at 10% load, 89.5% at 20%, 91.7% at 50%, 89.2% at 100%
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATX, 160x150x86 mm (Corsair); 150x85x160 mm (Hardware Busters)ATX 3.1, 150 x 86 x 160 mm
Modular cabling (fully, semi or non-modular)Fully modular, Type-4 cablesFully 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 PATA1x 16-pin 12V-2x6 (rated up to 600 W per NZXT) and 3x 8-pin (6+2) PCIe
Fan size and zero-fan mode1x 140mm fluid dynamic bearing fan with Zero RPM mode and manual override knob135 mm fluid dynamic bearing, PWM, 2,300 RPM ±10%, maximum noise 44.5 dBA, Zero RPM mode; silent below 50% load
Warranty (years)10 years10 years

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 ›

NZXT C850 Gold ATX 3.1

  • + 10-year warranty
  • + Fully modular with native 12V-2x6 cable
  • + Fan stays off below 50% load
  • − Only three 8-pin PCIe connectors
  • − Maximum noise rated at 44.5 dBA
  • − Efficiency drops to 85.8% at 10% load

Skip it if:

  • Builders running several GPUs that need more than three 8-pin PCIe connectors
  • Buyers who want Platinum-level efficiency at very low load
  • Anyone who needs published ripple and regulation data before buying
Read the full NZXT C850 Gold ATX 3.1 review ›

More comparisons

Compare all power supplies · Best power supplies