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FSP Dagger Pro 850W SFX Form Factor Power Supply, ATX 3.1 & PCIe 5.1 | 80+ Gold Efficiency, Native 12V-2x6 Cable, Fits SFF/ATX Cases, Full Modular, Japanese Capacitors, 10-Year Warranty, SDA2-850
FSP

FSP Dagger Pro 850W SFX Form Factor Power Supply (SDA2-850)

Bottom line: The FSP Dagger Pro 850W SFX Form Factor Power Supply is a specs-and-price decision rather than a crowd-consensus one in the power supplies category, priced around $159.99 on Amazon as of 2026-10-07. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

$159.99

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Buy on Amazon — $159.99 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 2026-10-07. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Backed by FSP's warranty and support channels

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

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SpecPicks Verdict

SpecPicks scored FSP Dagger Pro 850W SFX Form Factor Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. FSP'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.

Key Features

  • COMPACT SFX FORM FACTOR FOR SFF BUILDS: Maximize your desk space without sacrificing power. Designed for Mini-ITX and Micro-ATX gaming PCs, this unit includes a standard ATX bracket adapter to eliminate compatibility guesswork, ensuring a seamless installation whether you're building in a tiny ITX chassis or an ATX case.
  • ATX 3.1 & PCIe 5.1 READY: Future-proof your rig for top-tier hardware. Featuring the 12V-2x6 connector, this PSU effortlessly handles massive power spikes during intense gaming or AI workloads, ensuring peak performance and zero system crashes.
  • SEMI-FANLESS COOLING: Focus on your work or game without distracting PC noise. Equipped with a 92mm ball-bearing fan, the intelligent semi-fanless mode keeps the fan completely off under 20% load for absolute silence during light tasks, kicking in only when your system demands maximum cooling.
  • FULLY MODULAR & ULTRA-FLEXIBLE CABLES: Clean up your build and improve chassis airflow effortlessly. The fully modular design lets you connect only what you need, minimizing clutter and frustration in tight mini-ITX cases where space is extremely limited.
  • ULTIMATE PROTECTION WITH 100% JAPANESE CAPACITORS: Protect your expensive PC investment. Built exclusively with premium Japanese capacitors, this 80 PLUS Gold certified PSU delivers clean, rock-solid power while reducing heat. It effectively shields your components from voltage fluctuations and overloads, ensuring exceptional longevity and peace of mind.

Full Specifications

BrandFSP
Wattage850 watts
Fan Size2.5 inches
Model NameSDA2-850
Unit Count1 Count
Form FactorSFX
Model NumberSDA2-850-G5
CompatibilityPC
Connector TypeATX
Cooling MethodAir
Number of Fans1
Output Wattage850 watts
Item Dimensions4.92 x 3.93 x 2.5 inches
Mfr Part NumberPPA8503901
Compatible DevicesComputer, PC, SFF PC
Power Supply DesignFull Modular
Warranty Description5 year manufacturer
Maximum Input Voltage240 volts_of_alternating_current
Minimum Input Voltage100 volts_of_alternating_current
Item dimensions L x W x H4.92 x 3.93 x 2.5 inches
Full listing titleFSP Dagger Pro 850W SFX Form Factor Power Supply, ATX 3.1 & PCIe 5.1 | 80+ Gold Efficiency, Native 12V-2x6 Cable, Fits SFF/ATX Cases, Full Modular, Japanese Capacitors, 10-Year Warranty, SDA2-850

Ready to buy?

FSP Dagger Pro 850W SFX Form Factor Power Supply, ATX 3.1 & PCIe 5.1 | 80+ Gold Efficiency, Native 12V-2x6 Cable, Fits SFF/ATX Cases, Full Modular, Japanese Capacitors, 10-Year Warranty, SDA2-850 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 — $159.99

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

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FSP Dagger Pro 850W SFX Form Factor Power Supply, ATX 3.1 & PCIe 5.1 | 80+ Gold Efficiency, Native 12V-2x6 Cable, Fits SFF/ATX Cases, Full Modular, Japanese Capacitors, 10-Year Warranty, SDA2-850
$159.99
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