Seasonic Vertex PX
A premium, very quiet 1200W. Make sure you're buying the ATX 3.1 version.
- Efficiency
- 80+ Platinum
- Modular
- Full
- Standard
- ATX 3
- Form factor
- ATX
- Outputs
- 750 / 1200W
The verdict
The Vertex PX is Seasonic's high-end Platinum line. On my list it comes in 750W and 1200W, and the 1200W is the one reviewers have tested.
Both reviews found it very well built and quiet. HWBusters measured average noise among the lowest of any 1200W unit, though efficiency drops at light loads. NikkTech's test of the newer ATX 3.1 edition found near-excellent rail stability.
It's expensive, and HWBusters calls the price sky-high. Check the listing says ATX 3.1, since the older version uses the 12VHPWR plug.
Seasonic Vertex PX reviews
HWBusters tested the ATX 3.0 PX-1200 and found it silent and well built, but expensive. NikkTech's hands-on test of the newer ATX 3.1 edition found the same build quality.
Both labs agree
- High build quality. HWBustersNikkTech
- Quiet, with a 135mm fluid dynamic bearing fan. HWBustersNikkTech
- Platinum-level efficiency at normal loads. HWBustersNikkTech
- Fully modular, with a single high-power 12V rail. HWBustersNikkTech
Also worth knowing
- Expensive, with mediocre 12V transient response, weak light-load efficiency and minor-rail protections that need tuning. The unit tested used the older 12VHPWR plug. HWBusters
- The ATX 3.1 Azure Dragon edition comes with a 12-year warranty and Japanese capacitors throughout. NikkTech
silent operation and you can afford its high price, the PX-1200 fits the bill.Vertex PX-1200, ATX 3.0NikkTech
Performance (rail stability) and quality wise the VERTEX PX-1200 Azure Dragon is just what you’d expect from SeasonicVertex PX-1200 Azure Dragon, ATX 3.1 (hands-on test)
HWBusters tested the ATX 3.0 version and NikkTech the ATX 3.1 Azure Dragon edition. NikkTech’s is a hands-on test and carries less weight.
Pick your output
- 750WMid-range builds, up to an RTX 5070 Ti class card.Check 750W price
- 1200WFlagship builds with plenty of headroom.Check 1200W price
Sizes assume a typical processor. Check your build in the wattage guide.
Other Tier A at 1200W
- undefined80+ TitaniumCheck price
- undefined80+ GoldCheck price
- undefined80+ PlatinumCheck price
- undefined80+ GoldCheck price
Specs
| Tier on my list | A · High-end builds |
|---|---|
| Wattages | 750W, 1200W |
| Efficiency | 80 Plus Platinum |
| Modular | Fully modular |
| Standard | ATX 3 |
| Size | ATX |
| Released | 2022 |
Seasonic Vertex PX questions
Is the Seasonic Vertex PX-1200 ATX 3.1?
Seasonic now sells an ATX 3.1 version with the 12V-2x6 connector. Earlier units were ATX 3.0 with the 12VHPWR plug, so check the listing.
Which Seasonic Vertex PX wattage should I get?
It comes in 750W, 1200W. Match it to your graphics card using the output guide above, or the calculator for your exact parts.
Is the Vertex PX-1200 quiet?
Yes. HWBusters found its average noise among the lowest in the 1200W category.