<s>
FlexATX	B-Device
is	O
a	O
motherboard	B-Device
form	O
factor	O
derived	O
from	O
ATX	B-Language
.	O
</s>
<s>
The	O
specification	O
was	O
released	O
in	O
1999	O
by	O
Intel	O
as	O
an	O
addendum	O
to	O
the	O
microATX	B-Device
specification	O
.	O
</s>
<s>
It	O
uses	O
a	O
subset	O
of	O
the	O
motherboard	B-Device
mounting	O
holes	O
required	O
for	O
microATX	B-Device
and	O
the	O
same	O
I/O	O
plate	O
system	O
as	O
ATX	B-Language
and	O
microATX	B-Device
.	O
</s>
<s>
FlexATX	B-Device
specifies	O
that	O
a	O
motherboard	B-Device
be	O
no	O
larger	O
than	O
,	O
and	O
can	O
have	O
no	O
more	O
than	O
three	O
expansion	B-Device
slots	I-Device
.	O
</s>
<s>
The	O
term	O
is	O
used	O
also	O
for	O
the	O
form	O
factor	O
of	O
a	O
PSU	O
that	O
is	O
smaller	O
than	O
a	O
standard	B-Language
ATX	I-Language
PSU	O
and	O
is	O
used	O
in	O
small	O
cases	O
that	O
host	O
a	O
FlexATX	B-Device
or	O
Mini-ITX	B-Architecture
motherboard	B-Device
or	O
in	O
thin	O
rackmount	O
servers	O
such	O
as	O
1U	O
racks	O
.	O
</s>
