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Seasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready | 80 Plus & Cybenetics Titanium A Fully Modular Dual 12V-2x6 RTX 5090 AMD RX 9000 Ready AI Workstation 12 Years Warranty
Seasonic

Seasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready

Bottom line: The Seasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready ($559.99 on Amazon as of 2026-10-21 12:20 UTC): Dual native 12V-2x6 connectors drive an RTX 5090 without adapters; main trade-off: 559.99 puts it well above mainstream 850W-1000W units. Another in-stock pick with the same 1600W 80 Plus Titanium fully modular ATX power supply: the Seasonic PRIME TX-1600 Noctua Edition, $754.00 on Amazon as of (price may vary).

$559.99

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Buy on Amazon — $559.99 Also on eBay → Compare to similar power supplies

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Dual native 12V-2x6 connectors drive an RTX 5090 without adapters
  • ✓ 1600W headroom for multi-GPU AI workstation builds
  • ✓ 80 PLUS and Cybenetics Titanium A certified efficiency
  • ✓ 100% Japanese capacitors throughout the build
  • ✓ 12-year warranty, one of the longest in the PSU market

Cons

  • ✗ 559.99 puts it well above mainstream 850W-1000W units
  • ✗ 1600W is overkill for a single-GPU gaming rig
  • ✗ ATX 3.1 depth may not clear compact or SFF chassis
  • ✗ Fully modular cable set adds routing time during a build

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SpecPicks Verdict

SpecPicks scored Seasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis 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.

Video review

THIS is the BEST PSU in the WORLD.... PERIOD! feat. Noctua x Seasonic TX1600 — Tech Notice on YouTube

Key Features

  • ATX 3.1 / PCIE 5.1 ready. Dual native 12V-2x6 connectors
  • 80 PLUS and Cybenetics Titanium A certified
  • Ideal for AI workstations
  • 100% Japanese capacitors
  • Hybrid fan control with 135 mm FDB fan

Full Specifications

BrandSeasonic
Wattage1600 watts
Model NamePrime TX-1600 ATX 3.1
Unit Count1 Count
Form FactorATX
Model NumberPrime TX-1600 ATX 3.1
Connector TypeATX
Cooling MethodAir
Number of Fans1
Output Wattage1600 watts
Item Dimensions8.2 x 6.1 x 3.5 inches
Mfr Part NumberPrime TX-1600 ATX 3.1
Number of Items1
Compatible DevicesComputer Systems, Components, and Devices
Connector Quantity1
Power Supply DesignFull Modular
Warranty Description12 years
Maximum Input Voltage240 volts_of_alternating_current
Minimum Input Voltage200 volts
Item dimensions L x W x H8.2 x 6.1 x 3.5 inches
Full listing titleSeasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready | 80 Plus & Cybenetics Titanium A Fully Modular Dual 12V-2x6 RTX 5090 AMD RX 9000 Ready AI Workstation 12 Years Warranty

Performance Data

View gaming FPS, AI inference throughput, and synthetic scores for the NVIDIA GeForce RTX 5090 — the core hardware component in this product. Benchmarks sourced from TechPowerUp, PassMark, and the r/LocalLLaMA community.

Which local LLMs fit in 32 GB?

32 GB holds a 30–35B model at Q4 with a long context window; a 70B model runs only with layers resident in system RAM.

  • ✅ 7–9B models (Llama 3.1 8B, Qwen 3 8B) — fits at Q4
  • ✅ 12–14B models (Qwen 3 14B, Phi-4) — fits at Q4
  • ✅ 20–27B models (Gemma 3 27B, Mistral Small) — fits at Q4
  • ✅ 30–35B models (Qwen 3 32B, QwQ 32B) — fits at Q4
  • ❌ 70B models (Llama 3.3 70B, Qwen 2.5 72B) — needs 48 GB+

Across 6 community runs from 4 sources, the NVIDIA GeForce RTX 5090 generates a median 185.9 tok/s on 7–9B models at Q4 (per Hardware Corner).

Per-model VRAM guide: which GPU for which LLM →

Ready to buy?

Seasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready | 80 Plus & Cybenetics Titanium A Fully Modular Dual 12V-2x6 RTX 5090 AMD RX 9000 Ready AI Workstation 12 Years 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.

Buy on Amazon — $559.99

*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.

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Seasonic Prime TX-1600 1600W Power Supply ATX 3.1 & PCIe 5.1 Ready | 80 Plus & Cybenetics Titanium A Fully Modular Dual 12V-2x6 RTX 5090 AMD RX 9000 Ready AI Workstation 12 Years Warranty
$559.99
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