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2-22 361834-002 Technical Reference Guide
System Overview
2.4 System Architecture
The systems covered in this guide feature an architecture based on the Intel Pentium 4 processor
and the Intel 915G chipset (Figure 2-11). These systems allow processor upgrading with the Intel
Pentium 4 family and offer flexibility in expansion capabilities.
All systems covered in this guide include the following key components:
■ Intel Pentium 4 with Hyper-Threading technology, 32-KB L1 cache and 1-MB L2 cache.
■ Intel 915G/GV chipset - Includes 82915G or 82915GV GMCH north bridge and 82801
ICH6 south bridge including an integrated graphics controller, dual-channel DDR1 or DDR2
SDRAM controller, serial and parallel ATA controllers, USB 2.0 controller, and PCI
controller supporting PCI 2.3 devices.
■ SMC 47B397 super I/O controller supporting PS/2 keyboard and mouse peripherals
■ AD1981B audio controller supporting line in, speaker out, and headphone out
■ Broadcom BCM5751 10/100/1000 network interface controller
The 915G/GV chipset provides a major portion of system functionality. Designed to compliment
the latest Intel Pentium 4 processors, the chipset serves the processor through a 800-MB
Front-Side Bus (FSB). Communication between the GMCH and ICH6 components occurs
through the Direct Media Interface (DMI). The SFF, ST, MT, and CMT form factors use the
integrated graphics controller of the 82915G that may be upgraded through a PCI Express x16
graphics slot. All systems include a PCI 2.3 slot, and feature as standard a serial ATA (SATA)
hard drive with support for legacy parallel ATA 100 devices including a MultiBay device.
Table 2-2 lists the differences between models.
Notes:
[1] Slot not accessible if PCI 2.3 full-height riser is installed.
[2] Requires adapter.
[3] 2nd serial port requires adapter.
Table 2-2.
Architectural Differences By Form Factor
Model USDT SFF ST MT CMT
Chipset 915GV 915G 915G 915G 915G
Memory sockets 3 4 4 4 4
DDR2 models? No Yes Yes Yes Yes
Graphics upgrade PCI 2.3 card
only
PCI-E or
PCI 2.3 card
PCI-E or
PCI 2.3 card
PCI-E or
PCI 2.3 card
PCI-E or
PCI 2.3 card
PCI Express x16
graphics slot?
No Yes [1] Yes [1] Yes Yes
PCI Express x1 slot? No Yes [1] Yes [1] Yes Yes
Serial / parallel ports Optional [2] Standard [3] Standard [3] Standard [3] Standard [3]
SATA interfaces 1 2 2 4 4