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Rectangular ATX power supply unit in matte black finish with modular cable sockets and a 135mm fan grille

Seasonic

Seasonic PRIME TX-850 850W 80+ Titanium ATX power supply

SKU CH-TG33-NJC8G MPN PRIME TX-850

An 850 W ATX power supply with 80 Plus Titanium efficiency, full modular cables and a 135 mm fluid-dynamic-bearing fan rated for 50,000 hours

  • Max wattage850 W
  • Power efficiency94 % efficiency at 50 % system load
  • Modular cablingFull Modular
  • Fan configuration135 mm Fluid Dynamic Bearing Fan w/ Hybrid Fan Control Fan C
  • Power factor correctionActive
  • Main power connector20+4Pin

Model ATX Titanium (850W)

  • 850 W Titanium efficiency cuts electricity waste with 94 % at 50 % load
  • Fanless mode option via S3FC switch keeps noise at Cybenetics A++ level
  • Single +12 V rail delivers 70 A with under .5 % load regulation
  • Full modular cabling includes 6 PCIe and 10 SATA connectors for clean builds
  • 12 year warranty backed by 150000 hour MTBF and Japanese capacitors

850W Titanium ATX power supply

The Seasonic PRIME TX-850 is an ATX12V/EPS12V unit rated for 850 W continuous output. It carries 80 PLUS Titanium certification with 94 % efficiency at 50 % load. A single +12 V rail delivers 70 A for stable GPU and CPU power. The 170 mm depth fits standard ATX cases.

Full modular cabling and hybrid fan control

Every cable detaches so only required leads stay in the chassis, reducing clutter and improving airflow. Six 6+2-pin PCIe connectors and ten SATA power plugs cover multi-GPU and storage arrays. The 135 mm fluid-dynamic-bearing fan runs in a selectable fanless mode below low-load thresholds, then ramps under Premium Hybrid Fan Control for Cybenetics A++ acoustics.

Check clearance and connector needs before ordering

Verify the 170 mm length clears drive cages and cable routing space in your case. Confirm the motherboard accepts a 20+4-pin main connector and an EPS12V CPU plug. Ensure the six PCIe 6+2-pin leads match your graphics card requirements and that ten SATA connectors suffice for drives. The unit operates on 100-240 V mains at 50/60 Hz.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $182.99
Pricier than about 60% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSeaSonic
Product linePRIME Ultra Titanium
Model namePRIME TX-850 (SSR-850TR)
Product typeATX12 V / EPS12 V
Ports & slots
PCIe power connectors6 × 6+2-Pin
SATA power connectors10
Output type+3.3 V@20A, +5 V@20A, +12 V@70A
Connection types1 x Main Power 24/20 pins
2 x CPU 4/8 Pin
6 x PCI-E 6/8 Pin
10 x SATA
5 x Peripheral
1 x FDD
Power
Max wattage850 W
Power efficiency94 % efficiency at 50 % system load
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS TITANIUM Certified
Overvoltage protectionYes
Supply voltage100–240 V
AC input frequency50/60 Hz
Rated input current11–5.5 A
Size & build
Product dimensions3.39 in × 5.91 in × 6.7 in
Product weight9.2 lb (4.17 kg)
Shipping weight3.88 kg
Package size338 × 208 × 137 mm
Compatibility
PSU length limit170 mm
Environment & compliance
PSU noise ratingCybenetics A++
Regulatory approvalsSafety and EMC: cTUVus, TUV, CB, CCC, BSMI, EAC
Environmental Compliance: Energy Star, RoHS, WEEE, ErP Lot 6, REACH
More details
Fan configuration135 mm Fluid Dynamic Bearing Fan w/ Hybrid Fan Control
Fan Control: Premium Hybrid Fan Control
Fan Bearing: Fluid Dynamic Bearing
Life Expectancy: 50,000 h at 40 degree centigrade, 15% - 65% RH
Mean time between failures150,000 h MTBF at 25 degree centigrade, excl. fan: 150,000 h

Other versions of this model

5 more in the same range

Questions about this item

How long is the fan rated to last before it needs replacement?

The 135mm Fluid Dynamic Bearing fan has a life expectancy of 50,000 hours at 40 degrees Celsius and 15% to 65% relative humidity.

What is the first limit reached under sustained heavy load?

The single +12V rail is rated for a maximum of 70A, which is the primary current limit before protection circuits engage.

How loud does the unit get when running continuously all day?

It holds a Cybenetics A++ noise rating and the Premium Hybrid Fan Control offers a fanless mode below a certain load threshold for silent operation.

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