Biostar 865G MICRO 775 Spécifications télécharger pdf (Page 17)

115

Motherboard Types and Features

Inserts in

motherboard

slot

Right-angle slot

for expansion

card

Figure 3-17 PCI riser card provides a 3.3-V slot or 5-V slot depending on which direction the

card is inserted in the PCI slot

Courtesy: Course Technology/Cengage Learning

aware of these several variations. For instance, the ﬁrst two slots in Figure 3-18 are used by

cards that follow the AGP 1.0 or AGP 2.0 standards. These slots have key positions so that

you cannot put an AGP 3.3-V card in an AGP 1.5-V slot or vice versa. The third slot is a

universal slot that can accommodate 3.3-V or 1.5-V cards. All three slots are 2.9 inches wide

and have 132 pins, although some pins are not used. Figure 3-19 shows a motherboard with

an older AGP 3.3-V slot. Notice how the keyed 3.3-V break in the slot is near the back side

of the motherboard where expansion cards are bracketed to the case.

Another AGP standard, called AGP Pro, has provisions for a longer slot. This 180-pin

slot has extensions on both ends that contain an additional 20 pins on one end and

28 pins on the other end, to provide extra voltage for a high-end AGP video card that

consumes more than 25 watts of power. These wider slots might be keyed to 3.3 V or

AGP 1.0 1x 266 MB/sec 3.3 V Slot keyed to 3.3 V

AGP 2.0 1x, 2x, or 4x 533 MB/sec or 3.3 V or 1.5 V Slot keyed to 1.5 V

1.06 GB/sec

Slot keyed to 3.3 V

Universal slot (for

either 1.5-V or

3.3-V cards)

AGP Pro Applies to NA 3.3 V or 1.5 V AGP Pro 3.3 V keyed

all speeds

AGP Pro 1.5 V keyed

AGP Pro Universal (for either

1.5-V or 3.3-V cards)

AGP 3.0 4x or 8x 2.12 GB/sec 1.5 V and 0.8 V Universal AGP 3.0 (4x/8x) slot

Slot keyed to 1.5 V

Slot keyed to AGP Pro 1.5 V

Speeds (Cycles Maximum

Standard Per Clock Beat) Throughput Voltage Slots Supported

Table 3-4 AGP standards summarized

A+ 220-701

A+

220-701

1.2

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