Seasonic Prime TX-1600 ATX v3.0 PSU Review

Seasonic released the upgraded version of its TX-1600 PSU, with ATX v3.0 compatibility, meaning that it can deliver up to 3200W for a short period, if required!

The first TX-1600 model wasn’t ATX v3.0 compatible since it could deliver up to 2000W peak power, while it should go up to 3200W for ATX v3.0 and PCIe 5.0 compatibility, which is the case for the new TX-1600 version. So far, the only ATX v3.0 PSU with over 1500W capacity was the Thermaltake ToughPower GF3 1650, which is noisy as hell, so it is not a practical choice for users who want a silent PC. On the other hand, with a Cybenetics A noise rating, the TX-1600 is extremely quiet, especially if we consider its vast capacity.

With a 210mm length, you cannot call this a small PSU, but users needing 1600W will have to power PC parts that require a large chassis, so why downsize the PSU affecting its airflow and noise output? That said, checking if your chassis can accommodate it before investing in this PSU will be wise.

Not one, but two 12VHPWR connectors are available, set at 600W each. You cannot utilize both fully in transient response scenarios since this means 3600W, while the TX-1600 can handle up to 3200W loads, applied for 0.1ms. The ATX v3.0 spec does not set precise requirements for PSUs with a pair of 12VHPWR connectors since even one set at full power requires at least 1100W of total capacity.



Technical Specifications:
  • Manufacturer (OEM): Seasonic
  • Max Power: 1600W
  • Cybenetics Efficiency: [115V] Cybenetics Titanium (91-93%)
  • 80 Plus Efficiency: Titanium
  • Noise: Cybenetics A (20-25 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: 3.11 kg (6.86 lb)
  • Warranty: twelve years
  • MSRP (excluding VAT): $530
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18 thoughts on “Seasonic Prime TX-1600 ATX v3.0 PSU Review

  1. Thanks, super useful stuff. Where did the XPG Fusion 1600 results come from? Have you tested that one as well?

  2. Saw some conflicting information on the net, so I wanted to ask the expert. Are the 12vhpwr connectors on this PSU capable of outputting the full 600 watts? I know the 12vhpwr cable itself supports 600 watts (melting issues aside), but I saw some forums stating the PSU only outputs 450 from the connectors. For context, I have Gigabyte 4090 Gaming OC which has a power limit of 600 watts, so I want to make sure I pick a PSU that can feed it if I decide to tinker with overclocking. Thanks.

    1. Yes they are. Also please note that according to my measurements, 450W vs 600W on an RTX 4090 doesn’t provide anything significant on performance perspective.

  3. Hello, this might be a dumb question, but this PSU isn’t available as of now (14th June 2023), is it? I looked all over Seasonic’s website and all I can find is a ATX 2.5 TX-1600 PSU, which is not ATX 3.0 and therefore PCI Gen 5 ready.

      1. There are reddit rumors that some guy contacted them and they informed him about an ATX 3.1 version coming sooner or later so maybe we will never see the ATX 3.0 en masse in the EU.

  4. Excuse my ignorance but i can’t understand one point. How can transient response reach %200 load, when OPP or OCP set to %130?

  5. Great review. Any information on when this will be available in Europe or US? Can’t seem find it on Seasonics site either.

  6. I find it funny that every time it appears that analog PSU tech is dead Seasonic says “hold my beer.” I don’t remember which PSU review it was for on Tomshardware, but you said that to hit ATX 3.0 specs you figured Seasonic would need to go digital. They now have two ATX 3.0 PSUs that are still analog and are some of the best in their class.

    1. They did pretty well yes. Seasonic’s engineers don’t stop to push the analog technology high. Basically I was saying digital not for ATX v3.0, but for totem-pole and efficiency because to achieve even higher than Titanium, you definitely need totem-pole and by that time only through digital you could control such a PFC converter.

  7. Perhaps it would be useful to include a dummy result on each chart representing the next Cybenetics efficiency rating up from what Cybenetics rate the reviewed PSU at (and also the minimum spec for the actual rating of the PSU).

    For example:

    Average Efficiency
    115V AC Input (Higher is better)

    Silverstone DA1650-G: 89.27%
    Corsair HX1500i: 89.52%
    Thermaltake Toughpower GF3 1650W: 89.76%
    > [Cybenetics Titanium PSU min. spec.]: 91%
    be quiet! Dark Power Pro 12 1500W: 91.04%
    Thermaltake Toughpower TF1 1550W: 91.05%
    EVGA SuperNOVA 1600 T2: 91.35%
    ASUS RoG Thor 1600W: 91.73%
    XPG Fusion 1600W: 91.97%
    Corsair AX1600i: 92.22%
    Seasonic Prime TX-1600 (ATX 3.0): 92.27%
    Wentai Aidan – T616: 92.71%
    > [Hypothetical Cybenetics Diamond PSU]: => 93%

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