Seasonic Vertex GX-1000 - 1000W ATX 3.0 PSU review

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Seasonic Vertex GX-1000W (ATX 3.0 compatible) power supply

Today we’re putting the new Seasonic Vertex GX-1000W power supply on our test bench. The company is mainly known for its PSUs (like the Prime series, which we checked, for example, the TX-1300) and the chassis (like the Arch Q503 or Syncro Q704). The Vertex series is a new one from Seasonic that was launched in September 2022, but with the availability specified for January 2023. It consists of 80 Plus Platinum or Gold efficiency and has the following wattage variants:

  • 1200 W
  • 1000 W (which we’re checking in an 80 Plus version)
  • 850 W
  • 750 W

The main difference of Vertex versus the Prime and Focus series is the full ATX 3.0 compatibility. What does it mean in practice? Mainly it’s the implementation of the PCI-Express 5.0 generation’s power connector. These new power supplies carry the latest 12VHPWR power connector designed to deliver up to 600W of raw, unhindered power to the graphics card. Compared to ATX 2. X, which supports high load peaks but does not define a maximum above the nominal power of the power supply, ATX 3.0 represents clear target values. Specifically, the PCIe connection for the graphics card must allow load changes of up to three times the power consumption. Additionally, all Vertex GX-1000 models offer up to three (in 850-1200 W models, two for the 750 W variant) “traditional” PCIe 6+2 connectors for complete compatibility with the graphics card.



Under the hood, we have a Seasonic platform with the highest quality and reliability that distinguishes this brand. Vertex GX-1000W is an ATX power supply with a semi-passive mode. This time, it’s an 1000 Watt model (in black) with an 80 PLUS® Gold certificate, meaning it’s 90% efficient at 50% load @ 115 V and 92% efficient @ 230 V. It is crucial because less consumed energy goes to waste (at least not in a significant amount), and that should affect your energy bill. It is essential in these wicked times, where energy prices skyrocketed recently. Speaking of the fan – it’s 135 mm with PWM control that allows lower noise and keeps thermals in check. It’s possible to disable the fanless mode.


Seasonic Vertex GX-1000 is a fully modular PSU; even though the motherboard connectors are not permanently attached to the housing, you still must use most of them. Nearly all cases have a power supply shroud now (at least ATX-sized ones do), so the unit and the cables (with ribbon design for enthusiasts) will be hidden in most scenarios. There are no color variants, the only one available is black, but that’s typical for this kind of product.


There are also 750, 850, and 1200-watt versions to choose from. The 1000 Watts available in the reviewed unit should be enough for most users; even an i9 13900K combined with the Geforce RTX 4090 shouldn’t be a problem. Seasonic Vertex GX-1000 is built with 100% Japanese capacitors and other premium components to achieve 80 Plus Gold Certification; thus, that provides enhanced reliability and durability.
Ok, let’s check out this PSU from Seasonic, shall we? The unit is compact, measuring 160 mm x 150 mm x 86 mm. Vertex series has the following MSRPs:


  • VERTEX PX-1200: $ 259.99 / € 309.00
  • VERTEX PX-1000: $ 219.99 / € 259.00
  • VERTEX PX-850: $ 189.99 / € 229.00
  • VERTEX PX-750: $ 169.99 / € 199.00


  • VERTEX GX-1200: $ 229.99 / € 269.00
  • VERTEX GX-1000: $ 199,99 / € 239,00
  • VERTEX GX-850: $ 169,99 / € 199.00
  • VERTEX GX-750: $ 149,99 / € 179.00

A 10-year warranty backs Seasonic Vertex GX-1000.    

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