leadman powmax 2007 all new atx series safty power supply!

[370forlife]

Re: leadman powmax 2007 all new atx series safty power supply!

I was just saying it looks better built.

The chiefmax and real pc power had almost nothing in them. This has a bit more beefier heatsinks and some more input filtering, and a lot more secondary caps, even though they are the same brand.

With JG's reviews you can tell if a psu will blow your motherboard because he also shows the voltages, not just the watts, or there would be no point in the reviews.

[Oklahoma Wolf]

Re: leadman powmax 2007 all new atx series safty power supply!

jguru's basement roundup is a bit misleading: it's more important if psu can kill mobo than if it will destroy ITSELF if it's overloaded

You don't think the possibility of a cheapie burning the house down is as important as killing a mainboard?

I had two almost identical Powmax units in that test. One failed at significantly lower loads than the other. That kind of inconsistancy is IMO far more of a hazard than a mainboard killing 5VSB design because it could wipe out the rest of the system or worse.

[i4004]

Re: leadman powmax 2007 all new atx series safty power supply!

You don't think the possibility of a cheapie burning the house down is as important as killing a mainboard?

well, don't hold opened gasoline canister near the overloaded crappy psu.
<wink>

in the normal circumstances, no, i don't think these can burn down the house...ie, do inspect the materials their interiors are made of.
try to set alight any of those components.

so in that aspect, yeah, mobo safety is more important than what happens when overloaded(esp.. when you realize most of those materials are self-extinguishing).
me and 99% of people won't be overloading psus like your test did.
offcourse, i don't suggest buying such psus, but i would say biggest hazard is destroyed mobo than fire in the house.
again, unless you keep gasoline canister near the psu, and that canister is opened.
<wink>

That kind of inconsistancy is IMO far more of a hazard than a mainboard killing 5VSB design because it could wipe out the rest of the system or worse.

moot, or unclear at best; 5vstb is precisely what kills WHOLE system.
bangs you did in your test usually don't.
your bangs overload primary(and blow high voltage components), but that in itself rarely burns everything on the output.
poor 5vstby design does, when it goes bad.

as for "worse" well, tell me about few cases where psu burned the house down, and then i'll just ask "why leave it plugged in when leaving for prolonged periods?"
<wink>

btw. me and my freind had psus actually smoking(yes, crappy 5vstby designs)...i guess tnt wasn't close enough to blow the house....hehe...

With JG's reviews you can tell if a psu will blow your motherboard because he also shows the voltages, not just the watts, or there would be no point in the reviews.

no, you can't really, because he doesn't show us the voltages that happened when psus blow.
if he did, we would see nothing weird in these overloading events.
OTOH, we DO see major crap happening when 5vstby goes bonkers. for example 5v becoming 12v and then messing everything else too etc.
so no, he doesn't really test for mobo destroying events, and how could he, if that would take years to finish, as these 5vstby circuits need few years for lytics to dry and leak and then they start to act up...

for example, i strongly believe even the bestec that everell(forum member) modified would blow upon overload, but it surely won't make flaky 5vstby that will kill the mobo.

blowing upon overload and flaky 5vstby are 2 different things.
but again, that doesn't mean you should be buying those bargain basement psus...
mainly because crappy 5vstby circuits are usually found exactly on such models.

[momaka]

Re: leadman powmax 2007 all new atx series safty power supply!

i would say this is the worst sort of the psu one can bump onto; it seems it has that 5vstby circuit that kills mobos(no ic).

I don't think anyone is making self-oscillating 5vsb circuits anymore, not even the crappy companies. In fact, the only common PSUs that I've seen to use the self-oscillating 5vsb circuit were old Deers and L&C-built JNCs. But even Deer/L&C have now moved to using an opto-coupler for monitoring 5vsb voltages. Self-oscillating circuits are easy to spot since they have a transistor that regulates the 5vsb after it's rectified.
----
Powmax on the other hand has deteriorated in quality over the years. Not that they were good to begin with, but nowadays they are beyond horrible. The primary switchers that they use in their current PSUs are not even adequate for AA battery chargers. The design is still from the late '90s/early 2000s. Heatsinks are just a notch thicker than aluminum foil.

[370forlife]

Re: leadman powmax 2007 all new atx series safty power supply!

The thing is these blew at about 200-250W, but were rated for 650! I would say that is not overloading if it is supposed to output 650W.

The average consumer just assumes it is 650W, and will put a big load on it and it will blow up.

[Oklahoma Wolf]

Re: leadman powmax 2007 all new atx series safty power supply!

99% of people won't be overloading psus like your test did.

IIRC, one went out at 190W. That's real easy for a modern rig to exceed.

moot, or unclear at best; 5vstb is precisely what kills WHOLE system.
bangs you did in your test usually don't.
your bangs overload primary(and blow high voltage components), but that in itself rarely burns everything on the output.
poor 5vstby design does, when it goes bad.

Poor 5VSB won't kill hard drives, and yet my old Deer 250W had no trouble doing that over and over and over. One of those Powmax built units blew out the primary and the secondary when it died. Maybe it would have killed something, maybe not, but I'm not about to believe that such a massive blowout is helping anything.

as for "worse" well, tell me about few cases where psu burned the house down

Ok, so I was exaggerating a bit. The Deer 250W I spoke of had been known to burn itself. Mine had severe heat damage when I pulled it. IIRC there's a picture somewhere on this very forum of one gutted by fire. I saw reports of the same model setting cases on fire. All it takes is a unit like that parked under the curtains for a big, big problem.

for example, i strongly believe even the bestec that everell(forum member) modified would blow upon overload, but it surely won't make flaky 5vstby that will kill the mobo.

Actually, except for the bad VSB design, the 12E isn't too badly engineered. My recent test sample had properly working protection circuitry, even for a unit as old as that one was.

[370forlife]

Re: leadman powmax 2007 all new atx series safty power supply!

IIRC, one went out at 190W. That's real easy for a modern rig to exceed.

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