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Seasonic S12-II 500W Power Supply Review

Seasonic S12-II 500W Power Supply Review - PCSTATS
Price Check: $/£/€
Abstract: According to the Seasonic label, the +3.3V and +5V rails can both deliver 24 Amps, for a total combined output of 130W. There are two +12V lines, each can output 17 Amps for a combined output of 480W.
Filed under: Power Supply Published:  Author: 
External Mfg. Website: seasonic Aug 27 2007   Max Page  
Home > Reviews > Power Supply > seasonic S12-II

Testing the Seasonic S12 II Power Supply

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. That means a quieter 120mm fan can be used, and less noise for your ears.

PCSTATS tests power efficiency with the aid of an Extech Model 380803 Power Analyzer. The meter is located between the mains 120AC supply and the power supply, and a 120W dummy load is connected to the power supply being tested. Power jitter is measured with a Mastech MS8230B Multimeter at the device power connectors. The test apparatus and power meters are shown below.

The power supply looking device is actually the 120W dummy load. To the right is a standard Voltmeter, and in the background the Extech Model 380803 Power Analyzer (with readings for Watts, PFC/KHz, source voltage (AC) and Amperage).

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 Asus BLITZ EXTREME motherboard.

Power Jitter Observations - Motherboard

Listed Voltages

Lower Voltage

Upper Voltage

Jitter

+3.3V

3.3V

3.3V

0V

+5.0V

4.98V

4.98V

0V

+12V

12V

12V

0V

In the BIOS, the voltage lines are rock solid stable and do not jump at all. Pretty impressive but then again Seasonic is known for building good power supplies.

Power Jitter Observations - Multimeter

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

12V

12V

0V

The readings from the multimeter are virtually the same as what the motherboard BIOS reports.

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
Seasonic M12 700W 700 W
(A-PFC)
Active Power 161W 8W
Apparent Power 165VA 11VA
Corsair HX620W 620 W
(A-PFC)
Active Power 171W 8W
Apparent Power 173VA 12VA
Zalman ZM600-HP 600 W
(A-PFC)
Active Power 173W 5W
Apparent Power 175VA 9VA
HEC Zephyr 650 650 W
(A-PFC)
Active Power 185W 12W
Apparent Power 190VA 17VA
GlacialPower GP-PS550BP 550 W Active Power 178W 6W
Apparent Power 269VA 17VA
Cooler Master Real Power Pro 750W 750 W
(A-PFC)
Active Power 158W 6W
Apparent Power 163VA 9VA
Seasonic S12 II 500W 500W
(A-PFC)
Active Power 145W 7W
Apparent Power 148VA 10VA

The Seasonic S12 II 500W uses just 145W of power when a 120W load is hooked up. That's pretty good, and ranks for a 82.7% efficiency. The Seasonic S12 II 500W is actually the most efficient power supply PCSTATS has tested to date. This confirms it is worthy of the 80 PLUS designation

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Contents of Article: seasonic S12-II
 Pg 1.  Seasonic S12-II 500W Power Supply Review
 Pg 2.  Appearence and Physical Specifications
 Pg 3.  Polymer Aluminum Capacitor Inside the S12 II
 Pg 4.  — Testing the Seasonic S12 II Power Supply
 Pg 5.  Efficient Power Supply Triumphs over Vanity

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