Hardware Reference
In-Depth Information
Note
Although most ATX systems mount the power supply near the processor (on top in most
tower arrangements), this is not a requirement of the standard. Some systems mount the
power supply in other locations (such as on the bottom).
TheATXmotherboardshapeisbasically aBaby-ATdesignrotatedsideways90°.Theex-
pansion slots are now parallel to the shorter side dimension and do not interfere with the
CPU, memory, or I/O connector sockets (see
Figure 4.14
)
. In addition to a full-size ATX
layout,InteloriginallyspecifiedaMini-ATXdesign,whichisafullycompatiblesubsetof
ATX that fits into the same case:
• A full-size ATX board is 12 inches wide×9.6 inches deep (305mm×244mm).
• The Mini-ATX board is 11.2 inches×8.2 inches (284mm×208mm).
Figure 4.14
ATX specification 2.2 motherboard dimensions. Most recent ATX motherboards no longer use
ISA expansion slots.
