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Deepcool Gamer Storm DQ850-M PSU Review

Protection Features

Our protection features evaluation methodology is described in detail here.



12V1 (MBPH): 34.45A  (137.8%),11.78V
12V2 (CPU): 34A (136%), 11.56V
12V3/4 (VGA1, VGA2): >40.95A
5V: 29.6A (134.55%), 5.037V
3.3V: 28.7A (130.45%), 3.34V
5VSB: 4.7A (188%), 4.995V


1254.1W (147.54%)


✓ (125°C @ 12V Heatsink)


12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓


Proper Operation (but lower than 16ms)



Surge: MOV
Inrush: NTC Thermistor & Bypass Relay

The over current protection on the +12V rails is properly set, and the same applies to the rest rails as well. On the other hand, the over power protection is way higher than 130% which is a safe level.

The over temperature protection is present and working, while there is short circuit protection on all rails. Finally, the power ok signal is accurate, but it is much lower than 16ms that the ATX spec requires).

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 results are almost perfect. The 3.3V is kept lower than 12V and 5V at all times and the registered peaks are within 20ms.

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