Gamerstorm DQ850-M PSU Review

Crmaris September 25, 2018 Featured Announcement, Featured Tech News, Featured Tech Reviews, Power Supplies, Reviews

Protection Features

Our protection features evaluation methodology is described in detail here.

Protection Features
OCP	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
OPP	1254.1W (147.54%)
OTP	✓ (125°C @ 12V Heatsink)
SCP	12V: ✓ 5V: ✓ 3.3V: ✓ 5VSB: ✓ -12V: ✓
PWR_OK	Proper Operation (but lower than 16ms)
NLO	✓
SIP	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.