I would like to know one thing about the X-400(which I think might interest other people too, since it's sort of "the minimum cooling needs of the PSU to be happy"):
In a situation where the PSupply
- is in a separate-chamber(isolated from the other components)
- the chamber having positive pressure (only forced air on the intake),
- having its "out side"(the one with the power conector) being the only one in contact with the outside (so the air is forced through the PSU),
How much CFM would be needed to come from the intake for the PSU to not fetch ANY air from the outside?
This is not an answerable question -- "How much CFM..." type questions are never answerable because CFM itself is a totally nebulous quality for a fan: measured in free air w/o any impedance -- ie, it's a pure abstraction. Don't go there, there's nothing to be gained.
But I don't get why you'd say "for the PSU to not fetch ANY air from the outside?" The PSU has no fan so how could it fetch any air except via convection? And if there's an intake fan in the chamber, the air movement would be away from the fan (assuming at least, say, 300rpm) -- which presumably means out of the chamber through the x-400.
Thank you for reading and answering my post;
Sorry, I tried to not make a long post, since I was afraid it deviated a bit from this thread's subject(the article), and ended up not explaining well(together with my fault too)...
- What I meant with "CFM" was "volume of air through the PSU (so, from the PSU point-of-view, despite any variable impedances that may happen in specific cases)
- About the "not fetching any air" I was exactely talking about convection, so to try to be more clear:
What I wanted to know was how much volume of air was needed to pass through the PSU coming from the AirInputs sides towards the Output side to be sufficient for the PSU (and in my thinking, the psu not getting air from the outside would mean that).
[In my case it's because I wanted to use it in a filtered-case and didn't want the PSU to get dusty-air from the outside; but (i think) it also can be seen as a measure of this PSU's cooling needs]
Thank you for your time and effort,