Seasonic
Seasonic VERTEX GX-1200
Status: Seasonic VERTEX GX-1200 - 1200W - 80+ Gold - ATX…: Unavailable on Amazon as of . SpecPicks has no in-stock listing with matching specs on file; the search below lists current offers. eBay sellers may still list this model new or used.
Bottom line: The Seasonic VERTEX GX-1200: 1200W ATX 3.0 and PCIe 5.0 ready with a native 16-pin 12VHPWR cable for RTX 40/50 GPUs; main trade-off: warranty listed as 12 years in the title but 10 years in the spec sheet - confirm terms.
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Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives:
Similar: EVGA Supernova 1200 P2 80+ Platinum — $459.99 on Amazon as of 2026-10-06 12:20 UTC (price may vary).
Similar: Seasonic Vertex GX-850-850W - 80+ Gold - ATX 3.0… — $299.00 on Amazon as of 2026-10-06 12:20 UTC (price may vary).
Similar: Seasonic Vertex GX-1000-1000W - 80+ Gold - ATX… — $324.00 on Amazon as of 2026-10-06 12:20 UTC (price may vary).
Pros & Cons
Pros
- ✓ 1200W ATX 3.0 and PCIe 5.0 ready with a native 16-pin 12VHPWR cable for RTX 40/50 GPUs
- ✓ Tight +/-3% regulation on the 12V, 5V and 3.3V rails via a DC-to-DC converter design
- ✓ 80 PLUS Gold certified, with gold-plated high-current MB, CPU and PCIe terminals
- ✓ 135mm fluid dynamic bearing fan and Hybrid Silent Fan Control keep low-load noise down
- ✓ Fully modular cable-free layout using Japanese 105C aluminum electrolytic capacitors
Cons
- ✗ Warranty listed as 12 years in the title but 10 years in the spec sheet - confirm terms
- ✗ Gold efficiency only - Platinum and Titanium units exist in the 1200W class
- ✗ 1200W is more headroom than most single-GPU builds will ever draw
- ✗ No cable lengths, unit depth or connector counts given - verify fit in small cases
Manufacturer description
*High Efficiency, 80 PLUS® Gold Certified *ATX 3.0 and 16-Pin Gen 5 PCIe Cable (12VHPWR) *Fully Modular Cabling Design *135 mm Fluid Dynamic Bearing (FDB) Fan *Seasonic Hybrid Silent Fan Control *Highly Reliable Japanese 105 °C Aluminum Electrolytic Capacitors *Tight Voltage Regulation (12 V, 5 V and 3.3 V) [± 3 %] *Ample +12 V Output *DC to DC Converter Design *Cable-free Connection Design *Gold-Plated High Current Terminals (MB, CPU and PCIe) *10 Years Warranty
SpecPicks Verdict
SpecPicks scored Seasonic VERTEX GX-1200 using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Seasonic's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- Fully compatible with ATX 3.0 and PCIe 5.0 standards
- Full modularity for the best cable management options
- Added 12VHPWR cable to comply with the new graphic cards
- 135mm Fluid Dynamic Bearing (FDB) fan for quiet operation
- Seasonic Hybrid Silent Fan Control for optimal cooling
Full Specifications
| Brand | Seasonic |
|---|---|
| Wattage | 1200 watts |
| Model Name | Vertex GX-1200 |
| Unit Count | 1.0 Count |
| Form Factor | ATX |
| Model Number | VERTEX GX-1200 |
| Connector Type | atx,pcie |
| Cooling Method | Air |
| Number of Fans | 1 |
| Output Wattage | 1200 |
| Item Dimensions | 7.3 x 13.6 x 4.5 inches |
| Mfr Part Number | VERTEX GX-1200 |
| Compatible Devices | Personal Computer |
| Power Supply Design | Full Modular |
| Warranty Description | 10 years |
| Maximum Input Voltage | 264 Volts (AC) |
| Minimum Input Voltage | 110 Volts (AC) |
| Item dimensions L x W x H | 7.3 x 13.6 x 4.5 inches |
| System Bus Connector Type | 16 Pin |
| Connector Type Used on Cable | atx,pcie |
| Full listing title | Seasonic VERTEX GX-1200 - 1200W - 80+ Gold - ATX 3.0 & PCIe 5.0 Ready - Fully Modular - Premium Japanese Capacitors - 12 Year Warranty - Nvidia RTX 40/50 & AMD GPU Compatible |
Ready to buy?
Amazon shows no buyable offer for Seasonic VERTEX GX-1200 - 1200W - 80+ Gold - ATX… at the last check. A similar in-stock product is EVGA Supernova 1200 P2 80+ Platinum. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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