Phanteks
Revolt SFX 850W
AUTHOR:Onie T.
TESTED BY:Lucas N.
Published:

The Phanteks Revolt SFX 850W is an 850W, SFX form factor, fully modular ATX 3.0 power supply. It offers additional hybrid fan modes and is priced at a MSRP of $199.99 USD. 

This SFX form factor makes it an excellent choice for small form factor builds. However, the included cables, particularly the 12VHPWR cable, are notably short, which may present challenges in some setups. 

Despite this, the Revolt SFX 850W stands out for its high-quality cables and compact design, making it a recommended option for users seeking a reliable power supply for smaller builds.

WHAT YOU NEED TO KNOW

THE GOOD

  • Form Factor

    As an SFX form factor power supply, it’s ideal for small form factor cases and compatible with all ATX-supported cases when using the included adapter bracket.

  • Cables

    The flat ribbon cables are moderately flexible. However, the cables are shorter than normal PSU cables, with the 12VHPWR cable particularly short.

THE BAD

  • Nothing at the time of writing

THE REST

  • Overall

    We recommend the Revolt SFX 850W for its high-quality cables and compact design. It delivered solid performance in all tests, though it didn't stand out as exceptional.

LINKS
Where to buy*
NeweggAmazon

*This website uses affiliate links. Purchases made through these links may provide compensation to Linus Media Group.

Hardware
HardwareNotes

The Phanteks Revolt SFX 850W is a SFX form factor power supply. In the Box, the unit comes with several accessories, including a PSU and cable bag, as well as velcro cable ties for added convenience. While a PSU tester was listed among the accessories, the unit received by Labs was missing this item. 

The power supply features flat ribbon cables that are flexible, but their short length may pose challenges when connecting components within a computer case. Shorter cables are good for cable organization in small form factor cases, however users may be limited by cable reach in larger cases.

The Revolt SFX 850W is equipped with a 92mm fluid dynamic bearing fan, with a well-designed fan cover that may be visible in some small form factor cases. 

The power ratings and specifications meet the expected standards for this price range, although the temperature parameters could not be verified due to a lack of manufacturer-provided data.

In the Box

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Front of the box.

Construction

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Power input side of the PSU.

Case Format
Cable Form
Colour
Colour Theme
Case Width
Case Height
Case Length
Case Effective Length
Mass
Fan & Cooling
Top of the PSU displaying the fan.

Top of the PSU displaying the fan.

Cooling Method
Fan Diameter
Specifications
Bottom of the PSU displaying the specifications.

Bottom of the PSU displaying the specifications.

ATX Version
80PLUS Rating
Cybenetics ETA
Cybenetics Lambda
Input Frequency Range
Input Voltage Range
Operating Temperature Range
Storage Temperature Range
Cables
1xMotherboard
24-pin Motherboard:
1xCPU / PCIe
4+4-pin CPU:
1xCPU / PCIe
6+2-pin PCIe:
1xCPU / PCIe
6+2-pin PCIe:
6+2-pin PCIe:
1x12VHPWR / 12V-2x6
12VHPWR (600W):
1xPeripheral / SATA
SATA:
SATA (Right Angle):
1xPeripheral / SATA
SATA:
SATA (Right Angle):
SATA (Right Angle):
SATA (Right Angle):
1xPeripheral / SATA
Molex:
SATA (Right Angle):
SATA (Right Angle):
SATA (Right Angle):
Power Ratings
+12 V+5 V+3.3 V+5 Vsb-12 V
CURRENT70.8 A20 A20 A3 A0.3 A
WATTAGE850 W100 W15 W3.6 W
850 W

Please note that the above ratings are manufacturer advertised specifications.

Features & Software
Features & SoftwareNotes

The Phanteks Revolt SFX 850W features a hybrid fan mode that adjusts the fan speed based on power usage, with no fan operation during low power and regular fan operation at higher power levels. This can be selected via a physical switch located on the rear of the power supply. 

This unit is also equipped with all standard protections expected for a power supply of this class, along with a 10-year warranty. All protections are present, with the -12V rail reaching a new limit of 300%, a threshold that has been added for both the -12V and 5Vsb rails.

Modes
Protections
Over Current Protection (OCP)
Over Power Protection (OPP)
Short Circuit Protection (SCP)
Over Temperature Protection (OTP)
Over Voltage Protection (OVP)
Under Voltage Protection (UVP)
Performance
PerformanceNotes

In performance tests, the Phanteks Revolt SFX 850W demonstrated solid capabilities. Across its full rated output power range of 850W, there was a 0.195V drop on the 12V rail, which is within ATX specifications and consistent with other power supplies tested. 

The PSU meets ATX ripple specifications, with the 12V rail showing a peak-to-peak signal ripple of 41 mV under full load. The 5V and 3.3V rails exhibited signal ripples of 21 mV and 29 mV, respectively. 

Although the Revolt SFX 850W managed to handle all power excursions, it failed to maintain ATX voltage limits in a single instance, though to an extent that is unlikely to impact reliability of sustaining regular workloads

Voltage Ripple
Load Regulation
Power Excursion

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Productivity & Efficiency
Productivity & EfficiencyNotes

The Revolt SFX 850W is rated at 80PLUS Platinum, achieving 92% efficiency at 50% of its maximum rated load. However, it dipped slightly into the 80PLUS Gold range for loads under 50% on a 230V input. This is offset by its high efficiency at higher wattages on 230V inputs, though it's worth noting that such high load points are less likely to be frequently reached in typical usage. 

The unit performed well in brownout tests, enduring a 13ms dropout at full rated load for both 115V and 230V inputs. The Over Power Protection engaged at a maximum of 148% of the rated load, with the 12V rail alone capable of 97A, or 137% of its rating. This protection ensures safety against component faults and allows for minor exceedances in power draw beyond the official rating.

Efficiency
Brownout
Brownout/Hold-Up Duration 115 V 60 Hz 20°C
Over Current Protection (OCP)
Test Configuration
Video Overview
Test Bench
AC Source
Automated Test Software
DC Load Mainframe
Dual Channel Loads
Chroma 63610-80-20
Environmental Chamber
Microphone
Multimeter
ON/OFF Controller
Chroma 80613
Power Meter
SC/OVP Tester
Chroma 80612
Thermocouple Scanner
Noise Analyzer
Single Channel Loads
Chroma 63640-80-80

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