Seasonic Prime PX-1600 ATX v3.0 PSU Review

Besides the upgraded TX-1600 model, Seasonic also released a new PX-1600 unit which meets the strict ATX v3.0 requirements, meaning that it can deliver up to 3200W for short periods to cope with the increased energy demands of the current and upcoming GPU generations. 

I have already reviewed the TX-1600 ATX 3.0 model, and the time has come to look at the PX-1600 ATX 3.0 (PX-1600 from now on). There are few options in the mega-Watt category since delivering the PSU’s double power is challenging even for 0.1ms if its max power exceeds 1.5 kW. Besides Seasonic’s models, the only other ATX v3.0 ready PSU with over 1.5 kW capacity is the Thermaltake ToughPower GF3 1650, which requires ear plugs to use it under load.

With a 210mm length, this is a large PSU, but a 1600W PSU will be used to power lots of parts, which won’t find in a small or even medium-sized chassis. It would be wise to check whether your chassis can accommodate a 210mm PSU before you buy the PX-1600.

Like the TX-1600, the PX-1600 comes with two 12VHPWR connectors, set to 600W each, allowing it to handle powerful workstations, equipped with a pair of RTX 4090s.



Technical Specifications:
  • Manufacturer (OEM): Seasonic
  • Max Power: 1600W
  • Cybenetics Efficiency: [115V] Cybenetics Titanium (91-93%)
  • 80 Plus Efficiency: Platinum
  • Noise: Cybenetics A- (25-30 dB[A])
  • Compliance: ATX v3.0, EPS 2.92
  • Operating Temperature (Continuous Full Load): 0 – 50°C
  • Alternative Low Power Mode support: Yes
  • Power 12V: 1600W
  • Number of 12V rails: 1
  • Power 5V + 3.3v: 125W
  • Power 5VSB: 15W
  • Cooling: 135mm Fluid Dynamic Bearing Fan (HA13525H12SF-Z)
  • Semi-Passive Operation: ✓ (selectable)
  • Modular Design: Yes (Fully)
  • High Power Connectors: 3x EPS (3x cables), 6x PCIe 6+2 pin (6x cables), 2x PCIe 12+4 pin (600W)
  • Peripheral Connectors: 18x SATA (5x cables), 3x 4-pin Molex (single cable)
  • ATX Cable Length: 620mm
  • EPS Cable Length: 700mm
  • 12VHPWR Cable Length: 750mm
  • Distance between SATA: 155mm
  • Distance between 4-pin Molex: 125mm
  • In-cable capacitors: No
  • Dimensions (W x H x D): 150 mm x 85 mm x 210 mm
  • Weight: 3.07 kg (6.77 lb)
  • Warranty: twelve years
  • MSRP (excluding VAT): $446
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5 thoughts on “Seasonic Prime PX-1600 ATX v3.0 PSU Review

  1. Based on your suggestions bought the PX-1600. Amazing quality and cables are braided. Saved around 130 USD compared to the TX version.
    I am using on a 220v socket so efficiency must be even better.

  2. Ok, thanks for replying crmaris. I’ve had good experience with Seasonic so far & their Prime range so I’ll stick with them, thanks again for your time & in-depth reviews.

  3. Hi crmaris, thanks for your reviews on the TX & this PX, awesome job.

    Are these cons significant enough to deter someone like yourself from buying one?
    Have you tested/reviewed a better high end alternative or more simply, which PSU in the 1300W+ category would be your go to right now?

    1. Hi! So far there isn’t any better choice in the ATX v3.0 and >1500W capacity. I haven’t tested something better. The Corsair AX1600i has higher overall performance but it isn’t ATX v3.0 compatible

  4. Very extensive review. I have the old Prime PX-1300 that has the 12v sense defect. I disconnected the wire and the PSU hasn’t turned off abnormally since when overclocking my 7900 XTX. My next PSU will definitely be ATX 3.0-compatible but I don’t think I need a new one, especially considering the limited choices now. I hope Corsair will update the AX1600i soon but I bet it will cost an arm and a leg.

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