Apple Power Mac G5 - Manual (Page 9)

High-Bandwidth System
Architecture
The Power Mac G5 matches the advanced technology of the PowerPC G5 with a new
high-bandwidth system architecture. It begins with a 1GHz frontside bus
2 —one on
each processor in dual 2GHz systems—for maximum throughput to and from the
PowerPC G5. A point-to-point system controller allows data to move directly between
all subsystems, without impacting the processor. Bandwidth is further optimized by
a 400MHz, 128-bit memory bus
2 ; an AGP 8X Pro graphics bus; and a HyperTransport
interface that connects the PCI-X controller and the I/O subsystems to the system
controller. The result is phenomenal throughput for tackling the most intensive image
editing, media production, and scientific computing tasks—alleviating the limitations
and bottlenecks of the traditional PC.
9 Technology and
Performance Overview
Power Mac G5
System Architecture
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Frontside bus up to 1GHz. Provides up to 8-GBps
bandwidth between the processor and the rest of
the system.
Dual independent frontside buses up to 1GHz.
Provides up to 16-GBps aggregate bandwidth in
dual processor systems.
Advanced system controller. Uses a point-to-point
architecture to enable data to pass directly between
subsystems.
400MHz memory. Supports high-speed PC3200,
128-bit DDR SDRAM. 2
AGP 8X Pro graphics bus. At 533MHz, doubles the
throughput of AGP 4X and provides added power
for high-end graphics cards.
133MHz PCI-X expansion. Supports advanced
high-performance PCI devices, providing total
throughput of up to 2 GBps. 2
High-performance I/O. Integrates hard disk drives;
SuperDrive; and FireWire 800, USB 2.0, networking,
and optical digital audio ports.
Serial ATA storage. Supports 150-MBps Serial ATA
drives for up to 500GB of fast internal storage. 3
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