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Seasonic S12 Energy Plus SS-650HT 650W Power Supply Review

Seasonic S12 Energy Plus SS-650HT 650W Power Supply Review - PCSTATS
Abstract: There are four +12V rails on the SS-650HT and each can deliver a maximum of 18Amps apiece with total power output of 455W.
 90% Rating:   
Filed under: Power Supply Published:  Author: 
External Mfg. Website: Seasonic Aug 09 2006   Max Page  
Home > Reviews > Power Supply > Seasonic S12 Energy Plus SS-650HT

Testing Seasonic's Latest Power Supply

The price of energy is increasing world wide, so any reduction in the amount of power a computer draws is a welcome change in our books. Power supplies which employ Power Factor Correction (PFC, or A-PFC) help ensure efficient conversion of AC to DC voltage, and reduce the amount of energy wasted as heat. The following power supply tests were all conducted with an Extech Model 380803 Power Analyzer located between the mains 120AC supply and the power supply, and with a 120W dummy load. Power jitter is measured with a Mastech MS8230B Multimeter at the device power connectors. The test apparatus and power meters are shown below.

Here is a picture of the test set up which we will use to evaluate the Seasonic S12 Energy Plus SS-650HT 650W power supply. The power supply looking device is actually a 120W dummy load.

Power Jitter Observations - Motherboard

Voltage jitter is read by accessing the power options displayed in the motherboard BIOS, with the system obviously in an unloaded state. *All voltages were read from the BIOS of an ECS RS480-M motherboard.

Power Jitter Observations - Motherboard

Listed Voltages

Lower Voltage

Upper Voltage

Jitter

+3.3V

3.25V

3.33V

0.08V

+5.0V

4.96V

4.98V

0.02V

+12V

11.8V

11.95V

0.15V

-12V

11.99V

11.99V

0V

-5.0V

5.00V

5.00V

0V

+5.0Vsb

5.00V

5.00V

0V

The voltage rails fluctuate slightly although it's nothing to be alarmed at. Even at the lowest voltages, the power supply still has plenty to go around and will not sacrifice system stability. Voltage levels are all pretty close the mark.

Power Jitter Observations - Multi-meter

Voltage jitter was read by a Mastech MS8230B Multimeter with the system in an unloaded state. During testing the power supply is was still connected to a full computer and voltage values.

Power Jitter Observations - Multi-Meter

Listed Voltages

Lower Voltage

Upper Voltage

Jitter

+3.3V

3.3V

3.3V

0V

+5.0V

5.0V

5.0V

0V

+12V

11.99V

11.99V

0V

It's interesting to see here that the digital multimeter is reporting much better values than we see from the BIOS. The 12V rail is hovering just a notch under 12V which is great to see. Next, load tests with the Seasonic 120W PSU tester and then our final conclusions on this unit.

Seasonic Load Tests Source: Seasonic

When looking at the Seasonic Power Supply test results we see two values, wattage and volt-amps. Since it might not be clear what they measure, here's a brief overview.

The volt-amp (VA) value is how much real power is being consumed by the power supply being tested to provide the wattage (W) value. The higher the VA value is, the more electricity is being used by the power supply. Because no electrical device is 100% efficient, there will always be some loss when converting AC to DC. The closer the volt-amps and wattage figures are to each other, the more efficient a power supply is. This is called the Power Factor: wattage / volt-amps = PF.

Since we're testing with a 120W dummy load, the load on the power supply (wattage) should be as close to this figure as possible. Anything above this load in apparent power describes the overhead and wasted energy (given off as heat) for the particular power supply being tested. For the unloaded tests, the wattage and volt-amp figures should be as close as possible to one another. The lower the figures are, the less power is being wasted.

Measurements were taken with an Extech 380803 Power Analyzer.

Seasonic Power Load Tests
Power Supply Model Wattage Test Type Loaded Unloaded
Seasonic SuperTornado 400 W
(A-PFC)
Active Power 177 W 6 W
Apparent Power 182 VA 7 VA
Vantec iON2 350 W Active Power 192 W 10 W
Apparent Power 277 VA 21 VA
Antec TruePower 330 330 W Active Power 195 W 22 W
Apparent Power 289 VA 38 VA
Ultra X-Connect Green UV 500W 500 W Active Power 193W 22 W
Apparent Power 307 VA 40 VA
AOpen Silent Power AO400-12AHN 400 W Active Power 179W 9 W
Apparent Power 275 VA 18 VA
Seasonic S12-430 430 W
(A-PFC)
Active Power 179W 6W
Apparent Power 180VA 9VA
PC Power and Cooling Turbo-Cool 510 Express/SLI

510 W
(A-PFC)

Active Power

200 W

29 W
Apparent Power 202 VA 32 VA
HEC Ace Power 580UB

580 W

Active Power

183 W

12 W
Apparent Power 272 VA 26 VA
HEC Win 550UB 550 W Active Power 184W 10W
Apparent Power 263VA 22VA
Akasa PowerPlus AK-P550FF 550 W
(A-PFC)
Active Power 194W 38W
Apparent Power 197VA 40VA
AOpen Prima Power AO700-12ALN 700 W
(A-PFC)
Active Power 172W 3W
Apparent Power 181VA 9VA
PC Power & Cooling Turbo-Cool 1KW 1000 W
(A-PFC)
Active Power 205W 25W
Apparent Power 207VA 32VA
Seasonic S12 600 600 W
(A-PFC)
Active Power 164W 7W
Apparent Power 173VA 9VA
Mushkin Enhanced XP-650 650 W Active Power 192W 22W
Apparent Power 279VA 43VA
Seasonic S12 Energy Plus SS-650HT 650 W
(A-PFC)
Active Power 150W 7W
Apparent Power 150VA 10VA

With a 120W dummy load, the Seasonic S12 Energy Plus SS-650HT 650W reaches 80% efficiency. The high efficiency of the Seasonic S12 Energy Plus SS-650HT means that you will have a lower overall electricity bill in the long term. Thus far, it is the most efficient power supply to pass through the PCSTATS labs, and the first of what I hope will be many 80 PLUS power supplies to come. Active power under load rests at 150W, and just 7W when unloaded. Apparent Power under load rests at just 150Volt-Amps, 10VA when unloaded.

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Contents of Article: Seasonic S12 Energy Plus SS-650HT
 Pg 1.  Seasonic S12 Energy Plus SS-650HT 650W Power Supply Review
 Pg 2.  Appearence and Physical Specifications
 Pg 3.  More details on the S12 Energy Plus SS-650HT Power Supply
 Pg 4.  — Testing Seasonic's Latest Power Supply
 Pg 5.  Improved Efficiency or Lip Service?

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