EVGA 450 B3 PSU Review

Protection Features & The OPP Flaw

Check out our PSUs 101 article to learn more about PSU protection features. Our protection features evaluation methodology is described in detail here.

Protection Features
OCP12V: ✗
5V: 30A (150%)
3.3V: 29.5 (147.5%)
5VSB: 5.1A (170%)
OPP579.788W (128.8%)
OTP✓ (150°C @ secondary side)
SCP12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓
PWR_OKOperates properly
NLO
SIPSurge: MOV
Inrush: NTC thermistor

The OCP triggering points on the minor rails are set quite high, especially at 5VSB. But that's nothing compared to OPP, which is improperly configured. In our case, the PSU's primary FETs couldn't handle the load, so they blew up. What worries us most is that the main fuse didn't blow as well, so every time you connect the damaged PSU to the mains network, fireworks ensue. That obviously shouldn't happen. Once something breaks on the primary side, the fuse has to blow so current doesn't pass through. As this PSU sits, it's a potential fire hazard.

We contacted EVGA almost two weeks ago for feedback from its PSU product manager, hoping for a hypothesis explaining why this happened. Unfortunately, we don't have a response to share with you yet, even though we provided all of the data we were asked for (testing conditions, serial number, and part number).

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  • raotor
    Blowing up on the bench & the fuse not blowing seems to me to be rather more than an issue. I'd like Tom's to go buy another retail 450 Watt unit & see if it does the same. In addition, I see no mention of the other units in the range being tested which is odd as all models within the B3 line were purchased. Do we know if, say, the 550 Watt version suffers from the same safety issue.

    Further, EVGA's lack of response to this fault is not good for their PR. I'd even go so far as to suggest that such a dangerous failing should be grounds for banning this model from sale until EVGA can recall & fix the units.
  • termathor
    Hi there,

    Curious if EVGA came back to you, guys @ Toms Hardware on this on this fuse not working ...
    Seems to me the issue was serious enough to warrant an investigation !

    Did they really not come back with an explanation ????