PSUs

Seasonic Focus GX-850 V4 ATX v3.1 PSU Review

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The Seasonic Focus GX line got an upgrade to meet the strict ATX v3.1 and PCIe 5.1 requirements, and in today’s review I will look at the model with 850W max power.

The Seasonic Focus GX-850 V4 ATX v3.1 is (or will be) included in my best ATX v3.x & PCIe 5.x PSU picks article.

Seasonic recently updated its popular Focus GX line, making it compatible with the ATX v3.1 and PCIe 5.1 standards. The line consists of three models with capacities ranging from 750W to 1000W. All have compact dimensions, with 140mm depth. Despite the small dimensions, Seasonic fit a 135mm diameter fan to keep noise output low. Seasonic also talks about the OptiSink design, which brings a new PCB layout to the Focus V4 units, aiming to increase reliability by improving heat dissipation and airflow. According to Seasonic’s claims, the latest PCB design offers an eightfold increase in heat dissipation, keeping the operating temperatures low and increasing the PSU’s reliability.

 

The prices of the Focus GX V4 units are the following

  • Focus GX-750: $ 129.99 (USA) / 119.90€ (Europe) / $119.99 (ROW)
  • Focus GX-850: $149.99 (USA) / 139.90€ (Europe) / $139.99 (ROW)
  • Focus GX-1000: $189.99 (USA) / 169.90€ (Europe) / $169.99 (ROW)
  • Focus GX-750 White: $139.99 (USA) / 129.90€ (Europe) / $129.99 (ROW)
  • Focus  GX-850 White: $159.99 (USA) / 149.90€ (Europe) / $149.99 (ROW)
  • Focus  GX-1000 White: $199.99 (USA) / 179.90€ (Europe) / $179.99 (ROW)

 

ATX v3.1 850W PSU Reviews:

Cybenetics PSU Test Database
Best ATX v3.x PSUs
Technical Specifications:
  • Manufacturer (OEM): Seasonic
  • Max Power: 850W
  • Cybenetics Efficiency: [115V] Cybenetics Platinum (89-91%), [230V] Cybenetics Platinum (91-93%)
  • Noise: Cybenetics A- (25-30 dB[A])
  • Compliance: ATX v3.1, EPS 2.92
  • Operating Temperature (Continuous Full Load): 0 – 50 °C
  • Alternative Low Power Mode support: Yes
  • Power 12V combined: 850W
  • Number of 12V rails: 1
  • Power 5V + 3.3v: 100W
  • Power 5VSB: 15W
  • Cooling: 135mm Fluid Dynamic Bearing Fan (HA13525H12F-Z)
  • Semi-Passive Operation: ✓ (Selectable)
  • Modular Design: Yes (Fully)
  • High Power Connectors: 2x EPS (2x cables), 3x PCIe 6+2 pin (3x cables), 1x PCIe 12+4 pin (600W)
  • Peripheral Connectors: 8x SATA (2x cables), 3x 4-pin Molex (1x cable)
  • ATX Cable Length: 620mm
  • EPS Cable Length: 610mm
  • 12+4 pin PCIe Cable Length: 750mm
  • 6+2 pin PCIe Cable Length: 750mm
  • Distance between SATA / 4-pin Molex: 150/120mm
  • In-cable capacitors: No
  • Dimensions (W x H x D): 150 mm x 85 mm x 140mm
  • Weight: 1.60 kg (3.5 lb)
  • Warranty: 10-years
  • MSRP (excluding VAT): $140

Power Specifications

Rail 3.3V 5V 12V 5VSB -12V
Max. Power Amps 20 20 70 3 0.3
Watts 100 840 15 3.6
Total Max. Power (W) 850
Pages:
  1. Prologue & Technical specifications
  2. Box & Bundle, Product Photos & Cables
  3. Part Analysis
  4. Load Regulation & Ripple Suppression
  5. Transient Response
  6. Hold-Up time, Inrush Current & PSU Timings
  1. Efficiency, Power Factor, 5VSB & Vampire Power
  2. Protection Features
  3. Noise Output
  4. Overall Performance
  5. Epilogue
Pages: 1 2 3 4 5 6 7 8 9 10 11
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