Three-component branch prediction logic
•Speculative superscalar inner core organization
•Fast, selective flush of incorrect speculative instructions and results
•Prediction of up to two branches per cycle
• Support for up to 16 predicted branches in flight
•Prediction hints added to branch instructions
•Prediction support for branch direction and branch addresses
Physical specifications
•58 million transistors
•130-nanometer, silicon-on-insulator (SOI) process
•Die size: 118 square millimeters
Comparison of PowerPC G4 and PowerPC G5
PowerPC G4 PowerPC G5
Architecture 32-bit 64-bit
Addressable memory 4 gigabytes 4 terabytes
Maximum clock speed 1.4GHz 2GHz
Frontside bus Up to 167MHz shared Up to 1GHz per processor
In-flight instructions 16 215
Floating-point units One Two
Integer units One Two
Load/Store units One Two
L1 data cache 32K 32K
L1 instruction cache 32K 64K
L2 cache 256K 512K
Branch prediction logic Local Local/Global/Selector
Process technology 180-nanometer 130-nanometer
Die size 106 square millimeters 118 square millimeters
15
White Paper
PowerPC G5
1
“World’s fastest” based on SPEC CPU2000 benchmark results and leading professional application performance tests
against 3GHz Pentium 4–based Dell Dimension 8300 and dual 3.06GHz Xeon-based Dell Precision Workstation 650.
SPEC CPU2000 benchmarks run with GCC 3.3 compiler and independently tested; professional applications tested by
Apple, June 2003.
2
Tests performed by Apple in June 2003 using preproduction Power Mac G5 units.The Power Mac
systems ran a PowerPC G5–optimized version of Photoshop 7.0.1 including optimized AltiVecCore, ACE, and BIB Carbon
Libraries; the Dell Dimension ran Photoshop 7.0.1.
3
Based on SPEC CPU2000 benchmark results against 3GHz Pentium
4–based Dell Dimension 8300 and dual 3.06GHz Xeon-based Dell Precision Workstation 650m, performed by VeriTest,
June 2003.
© 2003 Apple Computer, Inc. All rights reserved. Apple, the Apple logo, Final Cut Pro, Mac, Mac OS, and Power Mac are
trademarks of Apple Computer, Inc., registered in the U.S. and other countries. Velocity Engine is a trademark of Apple
Computer, Inc. Adobe is a trademark or registered trademark of Adobe Systems Incorporated in the U.S. and/or other
countries. PowerPC is a trademark of International Business Machines Corporation, used under license therefrom. SPEC
is a registered trademark of the Standard Performance Evaluation Corporation (SPEC);see http://www.spec.org for more
information. Other product and company names mentioned herein may be trademarks of their respective companies.
Product specifications are subject to change without notice. This material is provided for informational purposes only;
Apple assumes no liability related to its use. July 2003 L29540B
For More Information
For more information about the PowerPC
G5 processor, visit www.apple.com/g5.
For more information about the Power
Mac G5, visit www.apple.com/powermac.
