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[JonnyGuru] BFG LS Series Revisited

post #1 of 5
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Quote:
Once upon a time, yours truly took a look at two units from a new line in BFG's offerings, the LS series. Coming in at 550W and 680W, the series proved to be adequate performers if a little uninspiring in ways.

As with most things, Father Time has brought on some changes in the series lately. No longer is Fore Point being used as the manufacturer, but Enhance gets the job instead. It will be interesting to see if they're still the solid performers they were when I last looked at an LS model. The two I'm looking at today weigh in at 450W and 550W.

The boxes for these two units are almost identical in terms of advertising and yet different in size. This is because the LS550 is physically larger, boasting a 135mm fan while the 450W version only gets a 120mm air mover. As you can see from this picture, this side of the box shows you some specs, lists the box contents, gives you a connector count, and even gives you some pictures of the connectors themselves. A load table rounds things out. Why, things are more rounded out than that time I tried to remove a Robertson screw with a Phillips screwdriver. Ok, ok, so I did it more than one time. Hey, what else was I supposed to do, reach over that extra foot and a half to get the right screwdriver?

The side opposite to the one in the last picture has all the marketing hype for these units. Fortunately, both boxes are identical here so I only need to type this out once.
http://www.jonnyguru.com/modules.php...Story&reid=135
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post #2 of 5
Nice review but what exactly does he mean when he says that both PSU's are terrible when crossloaded?

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Falco did a song with Brigitte Nielson. Seriously. Brigitte Nielsen. Think about that. On second thought, it's probably better that you didn't.
Lolwut?
Edited by Derp - 2/18/09 at 5:12pm
post #3 of 5
Quote:
Originally Posted by Auld View Post
Nice review but what exactly does he mean when he says that both PSU's are terrible when crossloaded?
Those and most low-end PSUs are what is called group regulated. That means the filtering stage is shared by the 12V and 5V (usually that's the combo). To be specific they share windings on the same choke. When either the 5V or 12V is heavily loaded when compared to the other, voltage regulation suffers. So if you are running a 1A load on the 5V and a 40A on the 12V, voltages will likely be out of spec. But if you bump up the 5V load to a more reasonable 5A, then voltages will be much closer to where they should be. That is just the nature of inductors. They do this to cut costs and simplify the design a little.

The opposite of this is indy (independent) regulation where each main voltage gets it's own choke. Changes in any of the rails shouldn't noticeably affect the other voltages.
Edited by shinji2k - 2/18/09 at 5:34pm
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post #4 of 5
Quote:
Originally Posted by shinji2k View Post
Those and most low-end PSUs are what is called group regulated. That means the filtering stage is shared by the 12V and 5V (usually that's the combo). To be specific they share windings on the same choke. When either the 5V or 12V is heavily loaded when compared to the other, voltage regulation suffers. So if you are running a 1A load on the 5V and a 40A on the 12V, voltages will likely be out of spec. But if you bump up the 5V load to a more reasonable 5A, then voltages will be much closer to where they should be. That is just the nature of inductors. They do this to save costs and simplify the design a little.

The opposite of this is indy (independent) regulation where each main voltage gets it's own choke, and changes in any of the rails shouldn't noticeable affect the other voltages.
Wow, thank you for the thorough explanation! +1 more for the PSU Guru .
post #5 of 5
That was an easy question. I am far from guru level though .
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