#BESTEC ATX0300D5WC SPECS FULL#

They crossload easily because of that and could do better than that. My only other complaint about Bestec is that the capacitors they use on the secondary are often general purpose and have poor ripple ratings (add half-wave rectification to that and the ripple rating is even lower).

It should be the other way around - the +5V rail should have one STPS3045CW and the +12V rail two STPS20H100CTs. That is the sort of configuration I would expect to see in a 300W PSU from 2001, not 2011.

On the label it says the +5V rail can do 25 amps and the +12V rail can do 19 amps (18 for the +3.3V rail), and combined the +5V and +3.3V rails can do 175W, but when I looked inside, I found that the +5V rail has two STP3045CWs in parallel, the +3.3V rail one, and the +12V rail, only a STPS20H100CT! Note that this is a single transistor forward PSU so I think that's cutting it a little too close. My only complaint with that PSU is the heavy inclination of +5V power as opposed to +12V power - it should be the other way around for a PSU of that ATX +12V revision. It doesn't have any conductive glue, either, though haplessly +5VSB is flyback with the hot diode right next to a CapXon KF capacitor (2200uF/10V), so I know it will fail sooner than later. I see Bestecs often used in OEM PCs, from Dell to HP Pavilion, so they must be half decent, I would think - my father has an HP Pavilion with an ATX0300D5WC in it (Rev: B so it has the green light to indicate ON or OFF status) and it never gets hot and blows out ample air, and has never once been unstable (going on a little over a year of usage now).

Granted they're sleeve bearing so they're not fantastic but they are certainly better than the nonames and better than ADDA.

#BESTEC ATX0300D5WC SPECS FULL#

I don't think half-bridge is truly bad (though I dislike how the ripple frequency is double that of the mains by way of full wave rectification, so while that's not necessarily a problem for the PSU if the components inside are up to it, it means much more ripple not only going across the internal components but also going out, to my knowledge), but it says something if the truly lowest-end, cheap Chinese PSU manufactures cannot do much else successfully. Bestec have also moved on from the half-bridge topology, unlike so many other cheap Chinese PSUs. At least Bestecs can do their labeled rating with no problem, though it would have been nice if they had OPP too. Added to the fact that Bestec like to use CapXon or Jamicon capacitors, it's understandable why they fail so quickly.Д«estec power supplies are still much, much better than truly cheap, Chinese power supplies which deliberately remove almost all that is necessary for an operational PSU. My only other issue with Bestec is that they like to use flyback designs on the +5VSB circuit and this means much more stress added to the already inefficient and stressful linear regulation of that circuit (thusly the reason why you don't see +5VSB rated at anything more than a few amps), especially when it doesn't receive airflow (when AC power is not removed and when it's plugged in). And, as everell mentioned, a severe modification to the ATX-250-12E's fatal issue. They're not A+ grade but with a simple recap and with conductive glue amiss (unless they preferably use white glue) they can be good, and if need be, a relocation of the +5VSB diode.

Bestec atx0300d5wc specs