HP X Class 500/550MHz, Reference Manual

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32 Chapter 2
System Board
Accessory Board Slots
Accessory Board Slots
The following block diagram shows the position of the accessory board slots on the system
board.
Figure 2-3. Accessory Board Slots
AGP Slot
The Accelerated Graphics Port (AGP) bus, provides a high performance graphics interface.
It uses a 66 MHz base clock, and provides a peak bandwidth of 528 MB/second.
AGP supports several modes, which are listed below. In its basic mode, AGP is very much like a 66 MHz
PCI bus; in a more advanced mode, pipelining is added along with special sideband signals, thereby
improving the bus performance. A double-clocking mechanism enables data transfers on both rising and
falling edges of the clock, which brings the maximum bandwidth to 528 MB/s: 66 MHz x 2
(double-clock) x 4 (bus width = 32 bit).
The different AGP modes include:
• Basic AGP: 66 MHz, PCI-like. Bandwidth: 265 MB/s.
• Pipelined AGP: 66 MHz + pipeline.
• Sideband AGP: 66 MHz + pi sideband signals.
• Full AGP: 133 MHz equivalent (66 MHz with double clocking) + pi sideband
signals. Bandwidth: 528 MB/s.
The AGP bus interface is explained in the section “Accelerated Graphics Port (AGP)
Controller.”
Four PCI slots. Can be used for a
32-bit PCI board. PCI Slot 3 has a
RAIDport for the HP FastRAID
board.
J38 (PCI Slot 2)
J37 (PCI Slot 1)
System board edge
J39 (PCI Slot 3)
+RAIDport (J23)
J40 (PCI Slot 4)
J46 (ISA Slot
One AGP slot. Can be used for a
graphics controller.
One Combination slot. Can be used
for either a full-length 32-bit PCI or a
full-length 16-bit ISA board.
J34 (AGP Slot)
J41 (PCI Slot 5)