[Info-vax] ChatGPT solved it for me, again...

[Steven Schweda]

> [...] says that XP1000 has a 400W power supply

   And you believed it?  Input or output?  I know nothing, but the label
on an AcBel API-6108 (DIGITAL P/N 30-48584-01) says:

> INPUT:  100-120V [AC] , 50/60Hz 8.0A
>         200-240V [AC] , 50/60Hz 4.0A
>
> DC OUTPUT:
>
>         +5.0V [DC] 42.0A  \--- TOTAL 325W MAX
>         +3.3V [DC] 50.0A  / \
>        +12.0V [DC]  8.0A    |--- TOTAL 400W MAX
>        -12.0V [DC]  0.5A    |
>         -5.0V [DC] 42.0A    |
>         +5VSB [DC]  1.0A    /

   I don't know how the power is consumed/divided in a real system, but,
hypothetically:

   The last four of those might add up to about 300W, leaving 100W of
the "TOTAL 400W MAX" group for the "+3.3V" supply.  That would leave
225W of the "TOTAL 325W MAX" group for the "+5.0V" supply.

   300W + 100W + 225W = 625W.  Whether one could actually wring that
much power out of it in a real XP1000, I couldn't say.  (Add dummy-load
resistors as required?)

   From those "INPUT" specs, I'd expect the input power to hit a max of
about 800W (100V * 8A).  (With less current at 120V, to eat the same
power.)

   I might guess that a (too-)quick read of those "TOTAL-MAX" figures
might have led someone to a (round) figure like 700W, which might not be
very far away from reality (closer to 600W, I'd say).

   As usual, everything's complicated.


> (I find this a competent support answer [...]

   I wouldn't rely on it in a case like this.  It might not be very hard
to get the right answer on a yes-no question about half the time,
whether you use right numbers or wrong numbers.