Reviews - BFG LS550 550W
Sample Provided by: BFG (By OklahomaWolf on Wed, Jul-23-2008)

Page 2 -

It's now time for the bread and butter of my review process. Oh, and some load testing too. I should really quit eating all this bread and butter... it makes me want to listen to the Irish Rovers for some reason.

Standard procedure here is to take ye olde power supply, toss it on a bench next to ye olde SunMoon SM-268 automated electronic load, and throw a set of five progressive load tests ranging from 20% to 100% of the label rating with respect to all combined load limits just to see if the unit can handle rated power and if so, how well it's able to handle it. Then, I try to throw the unit off balance using a double shot of crossloads - first, a load unbalanced toward the 5V and 3.3V rails, and then toward 12V. This kind of thing will show us just how good the regulation is, and whether or not you'd want to stick the unit on an old P3 rig or something. Once all that's complete, Snoopy will fight the Red Baron while I lock the unit in a hot box of my own nefarious design and repeat the whole deal to see how well the green alligators and long necked geese... er, power supply can take the heat.

Great - now I have that stupid unicorn song stuck in my head. Let me get the load tester working, and I'll just go get the power drill while you look at the table below. Wait, I know, I'll just drink and drink and drink to Lily the Pink and I'll forget all about that song. As long as I don't forget how to type.

Results from BFG LS550 COLD load tests

Test #

+3.3V

+5V

+12V

DC Watts/
AC Watts

Eff.

Intake/
Exhaust

Simulated system load tests

Test
1

2A

2A

7A

117W/
143W

82%

22°C/
26°C

3.33V

5.09V

12.21V

Test
2

4A

4A

15A

230W/
274W

84%

22°C/
29°C

3.31V

5.06V

12.19V

Test
3

6A

6A

23A

341W/
410W

83%

23°C/
33°C

3.30V

5.05V

12.16V

Test
4

9A

9A

30A

447W/
548W

82%

23°C/
39°C

3.29V

5.02V

12.16V

Test
5

11A

11A

37A

543W/
681W

80%

23°C/
44°C

3.28V

5.00V

12.12V

Test
CL1

18A

18A

2A

180W/
241W

75%

24°C/
36°C

3.29V

4.83V

12.74V

Test
CL2

2A

2A

40A

495W/
610W

81%

24°C/
42°C

3.30V

5.16V

11.77V

And I'm back, and only slightly less inebriated than the second most hammered I've ever not been. Just kidding, I'm really drinking Coke Zero.

The first thing that stands out at me is that the unit does indeed conform to 80 Plus guidelines in that efficiency stays above 80% over the majority of the unit's operating range. The only time it drops below that is in crossload test one, where it hits 75%, and this is not a normal situation for most computers out there due to the heavy 3.3V/5V imbalance. Thus, it is not a requirement for passing 80 Plus.

The bad news is, the unit is group regulated, as you can see the two crossload tests running the unit out of spec on the 12V rail in test one. However, like 680W big brother, the unit is actually pretty well behaved for a group design as most of the rails are still in spec on these tests. This is nice to see - usually these group designs go absolutely nuts on the crossloading.

When did I hear the fan, you ask? I didn't. The hot box should change that in a hurry though. If it's going to get loud, it's going to do it while I'm cooking me up a power supply.

Results from BFG LS550 HOT load tests

Test #

+3.3V

+5V

+12V

DC Watts/
AC Watts

Eff.

Intake/
Exhaust

Simulated system load tests

Test
1

2A

2A

7A

117W/
141W

83%

28°C/
33°C

3.32V

5.09V

12.19V

Test
2

4A

4A

15A

230W/
271W

85%

30°C/
36°C

3.31V

5.07V

12.17V

Test
3

6A

6A

23A

342W/
407W

84%

32°C/
41°C

3.30V

5.05V

12.15V

Test
4

9A

9A

30A

449W/
545W

82%

34°C/
53°C

3.28V

5.02V

12.14V

Test
5

11A

11A

37A

544W/
679W

80%

35°C/
62°C

3.28V

4.99V

11.95V

Test
CL1

18A

18A

2A

181W/
240W

75%

35°C/
43°C

3.28V

4.83V

12.75V

Test
CL2

2A

2A

40A

495W/
610W

81%

35°C/
53°C

3.30V

5.17V

11.75V

Predictably, not a lot has changed in the hot box. Except the efficiency, which has actually gone up to my astonishment. This time, I did hear the fan, and I heard it in test three.

BFG LS550

+3.3V

+5V

+12V

Test
1

Test
2

Test
3

Test
4

Test
5

Test
CL1

Test
CL2

I'll round out this page with some mighty impressive scope shots of this unit. Nothing to complain about here, these results are fantastic. Not a thing over 20mV.



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