This is a great power supply for 1200W but it was a steep price. I want with another brand and after about two weeks that power supply went out so I decided to go with this brand since it been around for awhile and is a manufacturer of power supplies for other companies also. It still going strong over two or three months without any issues.I bought two of these, 1 for my son and the other for my computer and they both worked well. I would recommend buying these if your machines need 1200W or less power. This also comes with the 600W power supply cable and is the new standard for the Nvidia 40
8.2Our score 4 photosSeasonic Vertex PX-1200 1200W Power Supply ATX 3.1 & PCIe 5.1 Ready
High Efficiency, 80 PLUS Platinum Certified
About this item
- 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
High Efficiency, 80 PLUS Platinum Certified
Ranked #99 in PC Parts · 4 things we like
Quick answer The Seasonic Vertex PX-1200 1200W Power Supply ATX scores 8.2/10 with us. Amazon owners rate it 4.1 out of 5 across 72 reviews, below the 4.5 average of the 82 internal power supplies we track. It was listed from $269.99 to $319.99 on Amazon depending on the option when we last checked in September 2026.
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
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Product information
23 specifications| Compatible Devices | Personal Computer |
|---|---|
| Connector Type Used on Cable | ATX |
| Output Wattage | 1200 |
| Form Factor | ATX |
| Wattage | 1200 |
| Cooling Method | Fan |
| Power Supply Design | Full Modular |
| Number of Fans | 1 |
| Fan Size | 14 centimeters |
| Maximum Input Voltage | 132 volts_of_alternating_current |
| Minimum Input Voltage | 100 volts_of_alternating_current |
| System Bus Connector Type | ATX |
| Item Dimensions | 6.3 x 5.9 x 3.4 inches |
|---|---|
| Item Weight | 2.7 kg |
| Model Name | VERTEX PX-1200 |
| Brand | Seasonic |
| Number of Items | 1 |
| Unit Count | 1 Count |
| Global Trade Identification Number | 04711173877769 |
| Model Number | VERTEX PX-1200 |
| Mfr Part Number | VERTEX PX-1200 |
| Warranty Description | 10 years |
| Item Highlight | 80 Plus & Cybenetics Platinum A Fully Modular 12V-2x6 RTX 5090 AMD RX 9000 Ready Japanese Capacitors 12 Years Warranty |
Pros & cons
- 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 Vertex PX-1200 1200W Power Supply ATX: questions & answers
Is the Seasonic Vertex PX-1200 1200W Power Supply ATX worth buying?
Owners are lukewarm on it, so compare the alternatives before buying. We score the Seasonic Vertex PX-1200 1200W Power Supply ATX 8.2 out of 10. Amazon owners rate it 4.1 out of 5 across 72 reviews, below the 4.5 average of the 82 internal power supplies we track.
How much does the Seasonic Vertex PX-1200 1200W Power Supply ATX cost?
It was listed from $269.99 to $319.99 on Amazon depending on the option when we last checked in September 2026. That is more than the $82.99 median for internal power supplies in our catalog. Amazon prices change daily, so use the price button on this page to see the current figure.
What options does the Seasonic Vertex PX-1200 1200W Power Supply ATX come in?
Amazon lists 5 options. Size: 750W, 1200W, 1000W. Style: 80+ Gold, 80+ Platinum. Pick an option on this page and the button opens exactly that model.
What are good alternatives to the Seasonic Vertex PX-1200 1200W Power Supply ATX?
Similar, well-rated internal power supplies in our catalog: Seasonic Focus GX-1000 1000W Power Supply ATX (9.6/10, 4.8 stars from 203 owners); Seasonic CORE GX-650 650W Power Supply ATX 3.1 (9.2/10, 4.6 stars from 142 owners); Seasonic Prime TX-1600 1600W Power Supply ATX (9.0/10, 4.5 stars from 133 owners).
Seasonic Focus GX-1000 1000W Power Supply ATXSeasonic CORE GX-650 650W Power Supply ATX 3.1Seasonic Prime TX-1600 1600W Power Supply ATX
Customer reviews
All reviews on AmazonBreakdown from the 10 most helpful reviews we imported.
Works like a charm
If you are considering buying a Seasonic power supply because of their advertised 10- or 12-year warranty, I strongly recommend you read my experience first.On August 1, my workstation suddenly experienced a power disruption, and the Seasonic power supply completely failed. The unit was only nine months old.Fortunately, I immediately took my workstation to a professional computer repair shop. They diagnosed the problem and confirmed that the power supply was completely dead.Because I rely on this workstation, I decided in good faith not to wait weeks for Seasonic. I purchased another brand-new
UPDATE: When I originally ordered this PSU it was ATX 3.0 and my unit had some issues with mild coil whine even after a replacement. I switched to an NZXT C1500 and sold the original PSU to a friend. I had originally given the PSU a 4-star rating.I just changed my PC case to downsize my build foot print as such while the NZXT C1500 fit it was the maximum possible PSU length and I couldn’t reinstall the cable/SSD cover and so I decided to reordered this PSU. I was pleasantly surprised to see that its been refreshed and it’s now an ATX 3.1 with a 12VHPWR 2x6 it’s got a really distinct blue head
The power supply has no issues, everything worked in my desktop build. The 600 W connector had to be unplugged and plugged into the supply several times before it worked. The connection is very tight, and it wasn't fully inserted initially. After several attempts, it was fully inserted and flush with the surface.It would be nice to have covers for unused power connectors inside the case to prevent dust build up, at least for SATA and PCIe. The covers are hard to find.** The power cable is only around 4.8 feet, should be at least 6 feet. ** At least state the power cord length in the specs.
great PSU, easy to install and use. enough power to supply my 5090 and 9950 cpu. the customer service sent me ATX3.1 cable so no need to upgrade it.
As expected from Seasonic it works perfectly and has plenty of cables. The were nice enough to send me the updated power cable for my 5090 for the cost of shipping despite being past the 90 day cutoff from day of purchase. It hasn't melted yet after a couple months of gaming. Power supply is quiet and I don't notice it. As it should be.
Llego en el dia de hoy, muy rapido desde la compra. Aun no se instalo pero llego en perfectas condiciones. Ni bien se utilice vere las prestaciones
Customer reviews are shown as published on Amazon and are not written by Do Best Deal.
















