Asus ROG Thor 1200W PSU Review – a heavily modified Seasonic!

1. Introduction2. Packaging, Contents & Exterior3. Teardown & Component Analysis4. Load Regulation, Hold-Up Time & Inrush Current5. Efficiency, Temperature & Noise6. Protection Features & DC Power Sequencing7. Cross-Load Tests & Infrared Images8. Transient Response Tests9. Ripple Measurements10. EMC Pre-Compliance Testing11. Performance, Value, Noise & Efficiency12. Final Analysis13. View All Pages

Protection Features

Our protection features evaluation methodology is described in detail here.

Protection Features
OCP	12V: 141.6A (141.6%), 12.188V 5V: 33.6A (134.4%), 4.980V 3.3V: 33.1A (132.4%), 3.315V 5VSB: 4.1A (136.67%), 5.018V, 69.26mV Ripple
OPP	1714.9W (142.91%)
OTP	✓ (160°C @ 12V Heatsink)
SCP	12V: ✓ 5V: ✓ 3.3V: ✓ 5VSB: ✓ -12V: ✓
PWR_OK	Proper Operation
NLO	✓
SIP	Surge: MOV Inrush: NTC Thermistor & Bypass Relay

The OCP at +12V and the OPP are set a bit higher than the normal, but the components used in this platform can easily cope since they are well above spec for a 1200W unit. The over temperature protection is working properly and the same goes for the power ok signal.

The OCP triggering point at 5VSB should be lower, in order not to allow this rail's ripple go out of the ATX specs.

DC Power Sequencing

According to Intel’s most recent Power Supply Design Guide (revision 1.4) the +12V and 5V voltages must be equal or greater than the 3.3V rail’s output at all times, during the power-up and normal operation. For our first measurement, we turn the unit off and switch it back on without any load in any of the rails.

In the second test, we set the PSU to standby mode, dial full load and start it afterwards. In the last test, while the power supply is completely switched off (we cut off the power or switch the supply off through its power switch), we dial full load before restoring power.

 

The 3.3V rail in all cases has a lower voltage than the +12V and 5V rails.

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