Seasonic
Seasonic Vertex PX-1200 1200W Power Supply
Bottom line: The Seasonic Vertex PX-1200 1200W Power Supply ($319.99 on Amazon as of 2026-10-06): 80+ Platinum certified for lower heat and power draw; main trade-off: 1200W overkill for mid-range single-GPU rigs.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 80+ Platinum certified for lower heat and power draw
- ✓ ATX 3.0 with native 16-pin 12VHPWR for RTX 40/50
- ✓ Fully modular cabling reduces clutter
- ✓ 1200W handles RTX 5090-class builds with headroom
- ✓ 12-year warranty on premium Japanese capacitors
Cons
- ✗ 1200W overkill for mid-range single-GPU rigs
- ✗ Hybrid fan mode can cycle on/off under light loads
- ✗ Large ATX 3.0 unit may crowd smaller cases
SpecPicks Verdict
SpecPicks scored Seasonic Vertex PX-1200 1200W Power Supply 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
- High Efficiency, 80 PLUS Platinum 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
Full Specifications
| Brand | Seasonic |
|---|---|
| Wattage | 1200 |
| Fan Size | 14 centimeters |
| Model Name | VERTEX PX-1200 |
| Unit Count | 1 Count |
| Form Factor | ATX |
| Model Number | VERTEX PX-1200 |
| Connector Type | ATX |
| Number of Fans | 1 |
| Output Wattage | 1200 |
| Item Dimensions | 6.3 x 5.9 x 3.4 inches |
| Mfr Part Number | VERTEX PX-1200 |
| Compatible Devices | Personal Computer |
| Power Supply Design | Full Modular |
| Warranty Description | 10 years |
| Maximum Input Voltage | 132 volts_of_alternating_current |
| Minimum Input Voltage | 100 volts_of_alternating_current |
| Item dimensions L x W x H | 6.3 x 5.9 x 3.4 inches |
| System Bus Connector Type | ATX |
| Connector Type Used on Cable | ATX |
| Full listing title | Seasonic Vertex PX-1200 1200W Power Supply, ATX 3.1 & PCIe 5.1 Ready | 80 Plus Platinum, Fully Modular, 12VHPWR Cable, RTX 40/50 Series Compatible, Premium Japanese Capacitors, 12-Year Warranty |
Ready to buy?
Seasonic Vertex PX-1200 1200W Power Supply, ATX 3.1 & PCIe 5.1 Ready | 80 Plus Platinum, Fully Modular, 12VHPWR Cable, RTX 40/50 Series Compatible, Premium Japanese Capacitors, 12-Year Warranty is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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