Table 1-5 Motherboard Form Factors

Table 1-5 Motherboard Form Factors - student2.ru

Form Factor Dimensions (mm) Details and Descriptions
     
ATX 305x244 The basic motherboard.
     
Micro ATX 244x244 A smaller square version ATX motherboard with
    fewer expansion slots.
     
ITX 215x191 Designed to be used with completely integrated
    devices. Not widely used, but inspired smaller
    mini-ITX design.
     

    Chapter 1: Hardware 17
     
     
Form Factor Dimensions (mm) Details and Descriptions
     
Mini-ITX 170x170 Designed to be used with completely integrated
    devices. Popular choice for Home Theater PCs and
    servers. Some feature a single PCIe x16 expansion
    slot.
     
BTX 325x266 Used by some retail and a few custom-built sys-
    tems; features integrated thermal module for cool-
    ing processor and memory modules.
     
NLX 254x228 Integrated AGP, NIC, and USB support. Now obso-
    lete.
     
LPX 330x229 Expansion cards are mounted on riser cards that
    can run parallel to motherboard or at a right angle
    and can, therefore, fit in to a smaller case. Now
    obsolete.
     

Expansion Cards and Slots

Expansion cards (also known as adapter cards) allow the motherboard to connect and control countless devices. Expansion cards connect to the motherboard via expansion slots. Adapter cards can also share some of the processing responsibility, which lightens the load on the CPU. Table 1-6 describes the standard expansion slots.

Table 1-6 Expansion Slots

Table 1-5 Motherboard Form Factors - student2.ru

Adapter Card / Bus Name Details and Descriptions

Bus Width

Table 1-5 Motherboard Form Factors - student2.ru


PCIe x1
  x4
  x8
  x16

Supports full duplex (sends/receives data simultaneous-ly). Throughput is 250MBps per lane (PCIe version 1) or 500MBps per lane (PCIe version 2). Each lane is x1. Four lanes = x4. Eight lanes = x8. Sixteen lanes = x16.

Table 1-5 Motherboard Form Factors - student2.ru


Mini-PCIe x1 1.5V, 3.3V version of PCIe x1 for laptops and note-
    books; mainly used for Wi-Fi
     
PCI Current standard, 32 bit and 64 bit, shorter than ISA;
    usually white; 64-bit version has three inline connectors
     
  Two inline connectors; usually white
     

18 CompTIA A+ Quick Reference

Table 1-5 Motherboard Form Factors - student2.ru

Table 1-6 Continued

Table 1-5 Motherboard Form Factors - student2.ru

Adapter Card / Bus Name Details and Descriptions
Bus Width    
     
Mini-PCI 33MHz, 3.3V, used in notebook and laptop computers
    for Wi-Fi and communications
     
PCI-X 64-bit Same slot design as 64-bit PCI
    133MHz (version 1.0), 266 and 533MHz (version 2.0)
     
AGP version 1.0 Dedicated graphics card slot, inset from rear of mother-
(AGP 1x, 2x)   board; runs at 66MHz
    1x throughput 266MBps
    2x throughput 533MBps
    3.3V slot
     
AGP version 2.0 1066MBps throughput
(AGP 4x)   1.5V slot
   
     
AGP version 3.0 2133MBps throughput
(AGP 8x)   0.8V and 1.5V slot (cards backward compatible with
   
    AGP v2.0)
     
AGP Pro Provides additional power; speeds vary
     
EISA Old technology, 32-bit version of ISA; backward com-
    patible with ISA
     
ISA Black
     
  Common in older PCs
     

Figure 1-8 shows the relative size and form factors of the common expansion slots. You should be able to identify these during your CompTIA A+ Certification exams.

Chapter 1: Hardware 19

Table 1-5 Motherboard Form Factors - student2.ru Table 1-5 Motherboard Form Factors - student2.ru

AGP Pro

AGP 4x/8x

PCI 33MHz/32-bit

AGP 1x/2x

1. PCI Express x16 slot

Table 1-5 Motherboard Form Factors - student2.ru

2. PCI Express x1 slot

3. PCI Express x4 slot

4. PCI slot (32-bit, 33MHz)

Figure 1-8 Expansion slot comparison.

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