Skip to content
sudopicks
esc

NZXT C850 Gold ATX 3.1 vs Seasonic FOCUS GX-850 ATX 3 (2024)

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

all judged against power supplies at a similar price

The Seasonic FOCUS GX-850 ATX 3 (2024) scores 6.8/10 overall, ahead of the NZXT C850 Gold ATX 3.1 at 6.7/10.

The NZXT C850 Gold ATX 3.1 leads on noise.

The Seasonic FOCUS GX-850 ATX 3 (2024) leads on efficiency and warranty.

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

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

Seasonic FOCUS GX-850 ATX 3 (2024)

6.8/10verdict: good, not the best

The Seasonic FOCUS GX-850 ATX 3 (2024) is for builders who want a fully modular 850 W unit with a native 12V-2x6 cable for a current graphics card. It suits buyers who value a 10-year warranty and strong efficiency figures on 230V mains. It is a weaker fit for anyone who puts tight voltage regulation or a consistently quiet fan first.

Typically about £144.95 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

CriterionWeightNZXT C850 Gold ATX 3.1Seasonic FOCUS GX-850 ATX 3 (2024)
Quality and protections30%5/105/10
Efficiency20%7/108/10
Cabling and connectors20%7/107/10
Noise15%7/105/10
Warranty15%9/1010/10
Overall6.7/106.8/10

Specifications

SpecNZXT C850 Gold ATX 3.1Seasonic FOCUS GX-850 ATX 3 (2024)
Rated output (W)850 W850 W
Efficiency rating (80 Plus or Cybenetics)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%80 PLUS Gold
Form factor (ATX or SFX) and ATX 3.x / PCIe 5.x supportATX 3.1, 150 x 86 x 160 mmATX
Modular cabling (fully, semi or non-modular)Fully modularFully modular
Graphics card connectors (12V-2x6 / 12VHPWR and PCIe 8-pin count)1x 16-pin 12V-2x6 (rated up to 600 W per NZXT) and 3x 8-pin (6+2) PCIe1x 12V-2x6 (native); 1x PCIe 12+4 pin (600W) per Hardware Busters; 3x PCIe 6+2 pin; 8x SATA; 3x Molex
Fan size and zero-fan mode135 mm fluid dynamic bearing, PWM, 2,300 RPM ±10%, maximum noise 44.5 dBA, Zero RPM mode; silent below 50% load135 mm fluid dynamic bearing fan; semi-passive mode (selectable)
Warranty (years)10 years10 years

Strengths and weaknesses

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 ›

Seasonic FOCUS GX-850 ATX 3 (2024)

  • + 10-year warranty, praised by owners
  • + Cybenetics Platinum efficiency despite the Gold label
  • + Fully modular with native 12V-2x6 cable
  • − Loose 12V load regulation per Hardware Busters
  • − Fan curve complaints; spins up early for some owners
  • − Cables reported as bulky or short

Skip it if:

  • Buyers who put tight 12 V voltage regulation first
  • Builders who need a consistently silent fan at low load
  • Anyone with a compact case who needs long, flexible cables
Read the full Seasonic FOCUS GX-850 ATX 3 (2024) review ›

More comparisons

Compare all power supplies · Best power supplies