38
2 System Board
Accessory Board Slots
the clock speed). Each packet of data contains four bytes, giving a transfer
rate of 66.6 MHz x 4 (quad-clock mechanism) x 4 bytes, a maximum
bandwidth of 1056 MB/s.
PCI Slots
There is a total of five Peripheral Component Interconnect (PCI)
32-bit, 33 MHz connectors on the system board.
The PCI slots accept 3.3 V and 5 V PCI 32-bit 33 MHz cards, and
Universal PCI cards (which are 3.3 V or 5 V compatible). Refer to
the table on the following page for the different PCI board
installations.
If an AGP Pro graphics card is present in the AGP Pro graphics slot
(Minitower models only), the PCI slot nearest the AGP slot
cannot be used.
The maximum supported power consumption per slot is 25W, either from
the 5V or the 3.3V supply and must respect the electrical specifications of
the PCI 2.2 specification. Total power consumption for the PCI slots must
not exceed 60 W.
The power consumption of each PCI board is automatically reported to the
system through the two Presence Detect pins of each PCI slot. These pins
code the following cases:
•
No accessory board in the PCI slot.
•
7 W maximum PCI board in the PCI slot.
•
15 W maximum PCI board in the PCI slot.
•
25 W maximum PCI board in the PCI slot.
AGP Video Card
AGP Operating
Mode
AGP 3.3 V
AGP 1.5 V
AGP Pro
≤
25 W
≤
25 W
≤
25 W
≤
50 W
≤
110W
PCI-type
yes
yes
no
no
no
AGP 1x
1
1.
With or without sideband addressing.
The AGP interface and bus are explained on
page 44
.
yes
yes
no
no
no
AGP 2x
1
yes
yes
no
no
no
AGP 4X
1
no
yes
no
no
no
