Biostar 865G MICRO 775 Spécifications télécharger pdf (Page 16)

CHAPTER 3

114

All About Motherboards

8-pin connector

Figure 3-16 8-pin PCIe Version 2.0 power connector

Courtesy: Course Technology/Cengage Learning

PCIe slot and it does not work, contact the manufacturer and ask for a ﬁx to the problem they

created by not accurately following the PCIe standards. How do you know what version PCIe

card or slot you have? You can’t tell by looking at the card or slot, so you have to depend on

ﬁnding the information in the documentation, user manual, or manufacturer Web site.

To get the full potential of PCIe Version 2.0, use PCIe Version 2 cards in Version 2 slots.

If you install a PCIe Version 1.x card in a PCIe Version 2.0 slot, the slot runs at a slower

speed to accommodate the card. If you install a PCIe Version 2.0 card in a PCIe Version 1.x

slot, the card runs at the slower speed of the slot.

PCIe version 3.0 is expected to be published sometime in 2010; it will double the

throughput of Version 2. However, after a standard is published, it takes some time for

manufacturers to produce the new products. For more information on PCIe, see the PCI

Special Interest Group site at www.pcisig.com.

PCI Riser Cards Used to Extend the Slots

Recall that an NLX motherboard uses a riser card that provides expansion slots for other

cards. You can also use a riser card in other systems besides NLX to extend an expansion

slot. For example, suppose you are installing a microATX motherboard into a low-proﬁle or

slimline case that does not give you enough room to install a PCI card standing up in an

expansion slot. In this situation, a PCI riser card can solve the problem. The riser card

installs in the slot and provides another slot that sits parallel to the motherboard. When

you install the expansion card in this riser card slot, the card also sits parallel to the

motherboard, taking up less space. These riser cards come for all types of PCI slots

including PCIe, PCI-X, and conventional PCI (see Figure 3-17).

THE AGP BUSES

Motherboard video slots and video cards used the Accelerated Graphics Port (AGP) stan-

dards for many years, but AGP has mostly been replaced by PCI Express. Even though AGP

is a dying technology, you still need to know how to support it. A motherboard will have a

PCI Express x16 slot or an AGP slot, but not both.

AGP evolved over several years, and the different AGP standards can be confusing. AGP

standards include three major releases (AGP 1.0, AGP 2.0, and AGP 3.0), one major change

in the AGP slot length standard (AGP Pro), four different speeds (1x, 2x, 4x, and 8x) yielding

four different throughputs, three different voltages (3.3 V, 1.5 V, and 0.8 V), and six different

expansion slots (AGP 3.3 V, AGP 1.5 V, AGP Universal, AGP Pro 3.3 V, APG Pro 1.5 V, and

AGP Pro Universal). To help you make sense of all this, Table 3-4 sorts it all out.

As you can see from Table 3-4, there are several different AGP slots and matching card

connectors that apply to the different standards. When matching video cards to AGP slots, be

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