Hello, Wayne.

From my ref. book - -

"The SFX power supply is specifically designed for use in small systems
containing a limited amount of hardware.  The PSU can provide 90 watts
of continuous power (135 watts at peak) in four voltages (+5, +12, -12,
and +3.3V).  This amount of power has proved to be sufficient for a
small system with a Pentium II processor, an AGP interface, up to four
expansion slots, and three peripheral devices - such as hard drives and
CD-ROMS. . . . Intel designed the SFX power suppy specification with
the micro-ATX motherboard form factor in mind, . . .."

The SFX don't provide -5V power, so can't fully support ISA bus.  Some
of the micro-ATX boards do have one or more ISA slots, but looks like
the absence of -5V isn't really a problem - the only reference I saw for
ISA cards using -5V was some of the "older" floppy drive controller
cards.

I've seen these SFX PS's in a number of those "mini-tower" cases.  They
were used in a number of HP Pavilion and Compaq Presario boxes, most
eMachines, and a few models by Gateway.

These PS are smaller than standard ATX, and use three screws to attach
to the case -  looking from back of box, two on the left and one on the
right.

There are two standard variants - on one, the cooling fan is inside the
PS case, and those are 63.5mm H, 100mm W, and 125MM D (depth into the
case).  The other is same W and D, but main box of the PS is only 60.5mm
high.  Screw holes are on same centers for both.  The 60.5 mm high units
are recognizable because they have a 90mm cooling fan mounted on top of
the case, protruding perhaps 1/2" higher than the main part of the case.

Looks like the first type could mount in a system which originally had
the second type, but the kind with fan protruding out the top might not
fit in a case designed for the first type.

As Tom Walker posted, some of these PS are only rated for 100 watts or
so.  I even saw a 90W unit at Ebay. Another common rating is 145W, and
one such is rated for the following - - +5V - 10A,  +3.3V - 10A,  +12V -
4.5A, -12V - 0.3A, and +5VSB - 0.8A.

One place where replacement SFX PS can be bought is Ebay.  A recent
search in the "Power Supplies" listings there produced about 5 hits
under "SFX" and about 35 hits by searching for "eMachine"
Higher-capacity replacement units are available, and I saw some 180W
units and some 200W units at Ebay.   The latter seem right pricey -
some of them listed at a bit over $30 for openers. Since some of the
sellers want about $10 for shipping,  that would get a 200W
replacement unit up to around $40, and a better option might be to buy
locally a low-end mid-tower case with standard ATX power supply.

Good luck. - - -  JimH.

... "Bother!" said Pooh, as his 'puter started acting flakey as Wheaties.
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