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Thermaltake Toughpower XT 850W Power Supply Review

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Temperature, Noise Levels and Fan Speeds:


I am not going to give a pass or fail in this section, as the ATX12V V2.2 does not really have any references on which to base a decision.

Temperatures are purely for information only, as there are too many variables involved when installed in a case, which, by the way, it wasn't. Ambient temperature, processor cooling efficiency and case cooling fans all play their part on the temperature of the air entering the power supply, and consequently the temperature of the air leaving it. No valid conclusions can be made from this test.



Temperature Differentials @ 230VAC
DC Loading
Temp In (°C)
Temp Out (°C)
Δ Temp (°C)
Fan Speed (RPM)


Whilst temperatures are indicative only, they are on par with other power supplies in its class. Fan noise at up to 50% load is barely audible at or about 1000RPM but becomes noticeable at 100% load and 2000RPM, which is to be expected.


FanDelayCool Feature Explained


The Thermaltake Toughpower XT 850W comes with a FanDelayCool feature. A three position slide switch on the back of the power supply, shown in the photograph, gives AUTO, D15 or D30 options that enables the user to manually set the duration of time the 140mm cooling fan will stay running after PC shutdown.

  • AUTO: Cooling fan stops immediately on PC shutdown.
  • D15: Cooling fan will keep running approximately 15-30 seconds.
  • D30: Cooling fan will keep running approximately 30-60 seconds.

I tested this feature and the cooling fan ran at the top end of the stated timings giving 30s for D15 and 60s for D30. Claims that the implementation of this feature will result in a more reliable and longer lasting power supply are almost certainly true and any feature that removes heat from the power supply is welcome. It is true that lower temperatures will increase the lifetime of components and therefore the overall reliability of the power supply but any gains really have to be quite low over the lifetime of the unit. I can't help but feel that it would make more sense to have two options, fan switches off at PC shutdown or fan remains running at shutdown until a certain temperature is reached. It's a nice touch and a welcomed one nonetheless.


S.P.T. Indicator Explained


There isn't a section to include this topic but I thought it deserved a mention so I've tagged it on at the end. The Toughpower XT 850W power supply is equipped with Thermaltake's new S.P.T. Indicator function. The S.P.T. Indicator enables the user to check the status of the power supply via three LEDs on the side panel.



S.P.T. Indicator
PSU Status
Green Light
1. Power supply and system in normal operation.
2. Power supply off in standby mode. PSU output +5VSB only. System turned off without unplugging the power chord and the PSU power switch still set to “I” position.
+5VSB abnormal.
PG Signal
Green Light
Power supply works without problem.
Red Light
Faulty power supply unit.
Green Light
Not over 100°C at the secondary side of power supply unit.
Red Light
Over 100°C at the secondary side of power supply unit.


The photograph shows all three LEDs green, indicating everything is well during testing. With mains connected, power supply mains switch on and the PC shut down, the green Standby LED lights are as expected. A full explanation of the different status LEDs is show above. These are pretty basic status indicators but they will help with first line fault finding should there be any problems.

  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation At 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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