This article covers Seasonic Focus V3 GX-1000-1000W.

Overview

The Seasonic Focus V3 GX-1000 (model SSR-1000FX3) is a 1000W ATX power supply with 80PLUS Gold certification. It fully supports the ATX 3.0 standard and comes with a native 16-pin PCIe Gen 5 (12VHPWR) cable, making it an excellent match for modern high-end GPUs like the NVIDIA RTX 30/40 series and AMD Radeon RX 7000 series. A fully modular cable design lets you connect only the cables you need, keeping your PC case tidy and airflow unrestricted. The unit measures just 140mm in depth, which is compact for a 1000W PSU and fits comfortably in most mid-tower and even some compact ATX cases. Cooling is handled by a 135mm fluid dynamic bearing (FDB) fan with a three-stage thermal control system. At low loads the fan stops entirely for silent operation, at medium loads it runs at a quiet speed, and under heavy load it ramps up for maximum cooling. You can also disable the hybrid mode if you prefer the fan to spin continuously.

Compatibility Guide

Form factor is standard ATX with a 140mm depth. This short length is a major advantage for cable management in smaller cases, but always double-check clearance for the modular connectors at the rear. Connector inventory includes: ATX 24-pin, EPS 12V (dual 8-pin CPU), four PCIe 6+2-pin, twelve SATA, four peripheral 4-pin, and one 600W-rated 12VHPWR cable. The native 12VHPWR cable eliminates the need for adapters when using RTX 4090 or RTX 4080 Super cards. With 1000W capacity, this PSU can handle a flagship GPU (RTX 4090) paired with a top-tier CPU (Core i9 or Ryzen 9) without breaking a sweat. For mid-range builds, it provides generous headroom for future upgrades.

Product Info

Released in 2023, the Seasonic Focus V3 GX-1000 sits in the upper-mid-range segment of the PSU market. It carries 80PLUS Gold certification (90% efficiency at 50% load) and is ATX 3.0 / PCIe Gen 5 ready. The 10-year warranty is a strong indicator of build quality and long-term reliability. Compared to Seasonic's own PRIME series, the Focus line offers a more attractive price-to-performance ratio while retaining excellent electrical performance and low noise. It's a popular choice among DIY builders who want a dependable PSU without paying a premium for Platinum or Titanium efficiency.

Best Use Cases

High-end gaming PC builders If you're pairing an RTX 4080 Super or RTX 4090 with a Core i7/i9 or Ryzen 7/9, 1000W gives you plenty of headroom for peak power spikes. The included 12VHPWR cable means no adapter dongles, reducing points of failure. Silence-focused users The FDB fan and three-stage thermal control keep the PSU nearly inaudible during idle and light loads. This is ideal for overnight rendering, streaming setups, or any environment where fan noise is a concern. Future-proof upgraders If you're building a mid-range system now but plan to drop in a high-end GPU in a couple of years, buying a 1000W PSU from the start saves you the hassle of swapping it later. ATX 3.0 support also ensures compatibility with next-gen GPU power requirements. ## Alternatives
A direct competitor is the Corsair RM1000x (2023). Both are 80PLUS Gold, fully modular, and ATX 3.0. The Seasonic Focus V3 GX-1000 is 20mm shorter (140mm vs 160mm), which helps in compact cases. Seasonic also manufactures its own units and offers a 10-year warranty, giving it an edge in perceived reliability. Another option is the be quiet! Straight Power 12 1000W, which boasts 80PLUS Platinum efficiency and excellent noise dampening. However, it costs more and is slightly longer. If absolute silence is your top priority and budget allows, the be quiet! is worth considering, but the Focus V3 GX-1000 delivers better value for most users.

Things to Consider

1000W is overkill for many builds. If you're using an RTX 4070-class GPU or lower with a mid-range CPU, a 750W or 850W unit would suffice and save you money. Only go for 1000W if you're running a flagship GPU or plan to upgrade to one soon. The PSU includes only one 12VHPWR cable. Multi-GPU setups or motherboards requiring two 12VHPWR connections are not supported. Also, with twelve SATA connectors, cable clutter can become an issue if you don't have many drives. When connecting the 12VHPWR cable, ensure it's fully seated. Incomplete insertion has been linked to overheating issues on some GPUs. Take your time and double-check the connection before powering on.

Compatibility Guide

Form factor: ATX (140mm depth) CPU sockets: Not directly applicable (connects via EPS 12V) Memory: Not directly applicable PCIe: PCIe Gen 5 ready with native 12VHPWR cable Storage: 12x SATA power, 4x peripheral 4-pin Recommended PSU wattage: 1000W (this unit's own rating)

Product Info

Release date: 2023 Price range: Approximately ¥26,000 ( reference) Warranty: 10 years Sales channels: , major PC parts retailers TDP: N/A (PSU) Key specs: 80PLUS Gold, ATX 3.0, fully modular, 135mm FDB fan * Market position:

Product Disclosure (Amazon)

  • Manufacturer: Seasonic
  • ASIN: B0C5B8B8SL
  • Note: This article covers a manufacturer-made product based on Amazon listing details.