Seasonic VERTEX GX ATX 3.1 Spec and Price in the United Kingdom
The gold VERTEX: the same 160mm ATX 3.1 chassis, the same 135mm fluid-dynamic-bearing fan and hybrid fan control as the platinum PX, at 90% efficiency at half load instead of 92%. It ships at 750W, 850W, 1000W and 1200W with a 12V-2x6 cable included, and carries Seasonic's twelve-year warranty. For most single-GPU builds this is the VERTEX to buy — the PX's extra efficiency point rarely pays for itself over the life of the machine.
Prices include VAT.
The last tracked price for the 1200W Seasonic VERTEX GX ATX 3.1 in the United Kingdom was £296.72 at Amazon.co.uk, captured 2026-10-07. Across one tracked merchant and 399 days of recorded prices, the 90-day median for the 1200W Seasonic VERTEX GX ATX 3.1 is £234.94 and the lowest recorded price is £189.71. This site began capturing prices on July 30, 2026; for Amazon listings, prices dated earlier come from Keepa's price history.
Captured periodically and may have changed.
- 850W
- 1000W
- 1200W
Each point is one day's recorded price, not a list price. Points dated before July 30, 2026, when this site began capturing prices, come from Keepa's Amazon price history. How we track prices
Specifications
- Wattage
- Efficiency
- 80 Plus Gold
- Form factor
- ATX
- Modular
- Fully modular
- ATX version
- 3.1
- Fan size
- 135 mm
- Length
- 160 mm
- Zero-RPM mode
- Yes
- Warranty
- 12 years
Wattages
| Configuration | Part number | Current best price |
|---|---|---|
| 750W | — | — |
| 850W | — | £405.57 Price too old to confirm |
| 1000W | — | £323.21 Price too old to confirm |
| 1200W | — | £296.72 Price too old to confirm |
What owners and reviewers say
Summarised from 1 source(s), reviewed September 13, 2026. A source is counted only where it names this model exactly. How we track prices
Commonly praised
- Uses high-temperature-rated Japanese capacitors, deliberately over-specified to sustain above its rating.
- Supports the latest power standards with a native high-power connector, and load regulation is among the tightest tested.
Commonly criticised
- Quality comes at a price, and it is hard to find in stock.
Sources behind this summary
Guides for this category
Sources
Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.