EVGA 450BT 450W Power Supply

PROD LINK: 450BT Product Page
PRICE: $44.99 @ NewEgg
Price is at the time of testing!

EVGA 450BT – Overshoot Transient Tests
VSB On VSB to 100%, 12V Off to 100%, 12V
O-Scope Shot O-Scope Shot O-Scope Shot

Moving on, we find the unit doing a surprisingly good job keeping those power on spikes in check. In fact, it’s smooth and continuous across the board. So that’s definitely a plus for this unit.

But what I’m certain is not a plus is the hot testing we’re about to do. I will try to get up to the forty degrees mark, but this load tester is so overpowered in comparison to the unit its testing, I doubt that will happen.

EVGA 450BT – Hot Load Tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive Load Tests
1 1A 1A 3A 45.2W/
118.9V 77.1% 0.747 26°C/
3.330V 5.09V 11.85V
2 1.2A 1.2A 6.5A 89.5W/
119.4V 84.5% 0.950 27°C/
3.329V 5.10V 11.82V
3 3A 3A 16A 220.7W/
117.3V 85.7% 0.982 31°C/
3.326V 5.10V 11.82V
4 4.5A 4.5A 24A 331.3W/
118.8V 84.4% 0.993 33°C/
3.323V 5.10V 11.81V
5 6A 6A 33A 452.3W/
118.4V 81.9% 0.997 36°C/
3.320V 5.10V 11.80V
Crossload Tests
CL1 10A 10A 0A 82.4W/
118.5V 76.0% 0.953 28°C/
3.315V 4.80V 12.40V
CL2 0A 0A 35A 395.4W/
117.5V 82.6% 0.995 35°C/
3.562V 5.39V 11.26V

The good news is, the unit lasted pretty well at temperatures up to thirty-six degrees. But as was the case with the 750 N1, it wasn’t comfortable enough to recommend doing it. I never got the ever-increasing power meter numbers indicating an impending failure on the primary side, but I did get the warning signs elsewhere.

That elsewhere happened to be at the 3.3V output. Test five showed no major problems. All voltages were stable, and I was looking forward to telling you that this unit was rated too conservatively. Then, the crossloads started. Test CL1 went fine, again telling me that this unit was designed for old 5V based hardware. But test CL2? Now, I had a problem in addition to all voltages being out of spec. In that test, the 3.3V rail started creeping upwards. Slowly but surely, it climbed higher and higher, ending up at a staggering 3.562V with no sign of stopping there. Given the way things were heading, I have very little doubt that the unit was getting ready to blow the 3.3V output parts, throwing the unit into protective shutdown (or perhaps even outright exploding) until said parts were replaced. The only reason it didn’t do that is that the full ten minutes of the test passed and I shut it down manually.

Of course, this means we have even worse results for voltage regulation. 7.48% on the 3.3V rail, 11.80% on the 5V, and 9.50% on the 12V. The average is 9.59%, or about double the ATX spec. All because these old group designs were never meant to be good at handling things modern systems throw at them.

EVGA 450BT – Oscilloscope
Test # +3.3V +5V +12V
1 O-Scope Shot O-Scope Shot O-Scope Shot
2 O-Scope Shot O-Scope Shot O-Scope Shot
3 O-Scope Shot O-Scope Shot O-Scope Shot
4 O-Scope Shot O-Scope Shot O-Scope Shot
5 O-Scope Shot O-Scope Shot O-Scope Shot
CL1 O-Scope Shot O-Scope Shot O-Scope Shot
CL2 O-Scope Shot O-Scope Shot O-Scope Shot

Moving down to the scope shots, I see 14mV at most on the 3.3V rail, 15mV on the 5V rail, and 32mV on the 12V rail.

That’s just enough to squeak into the excellent scoring bracket on all three rails, so there are at least some performance related benefits to this unit.

Let’s go take it apart.