Cooler Master GX III 1250W ATX v3.0 PSU Review

Protection Features

OCP (Cold @ 19°C) 12V: 131A (125.84%), 11.958V
5V: 24.6A (123%), 4.98V
3.3V: 24.3A (121.5%), 3.312V
5VSB: 5.9A (196.67%), 4.856V
OCP (Hot @ 40°C) 12V: 130.8A (125.65%), 11.965V
5V: 24.6A (123%), 4.985V
3.3V: 24.3A (121.5%), 3.318V
5VSB: 5.6A (186.67%), 4.877V
OPP (Cold @ 21°C) 1672.72W (133.82%)
OPP (Hot @ 39°C) 1571.13W (125.69%)
OTP ✓ (134°C @ secondary side)
SCP 12V to Earth: ✓
5V to Earth: ✓
3.3V to Earth: ✓
5VSB to Earth: ✓
-12V to Earth: ✓
PWR_OK Proper operation
NLO
Fan Failure Protection
SIP Surge: MOV
Inrush: NTC Thermistors (2x) & Bypass relay

The 12V rail is conservatively set, but having the same triggering point under cold and hot conditions is incorrect. Thankfully, this is not the case for over power protection, where the triggering point is notably lower at high temperatures. Moreover, the minor rails have correctly set over current points, which is a pleasant surprise since this is not true in most PSUs. Finally, all other essential protection features are present and work well.

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