Mobile CPU Specifications
Apple PowerPC G4 CPUs
Apple PowerPC G4 (Motorola 7451)
- Found in Apple's newest Powerbooks and iBooks at speeds of 800,
867, 933, 1000, 1250, and 1330 MHz. Changes to the CPU include:
The MPC7451 supports an L3 cache interface with on-chip
tags to support up to 2 MB of off-chip cache.
The L3 data bus is 64 bits wide, provides multiple SRAM
options, and affords critical quad-word forwarding to reduce latency.
The off-chip L3 storage can also be configured as a local addressable
memory.
The MPC7451 microprocessor contains separate memory management
units for instructions and and data, supporting 4 petabytes (252) of
virtual memory and up to 64 GB (236) of physical memory.
Apple PowerPC G4 (Motorola 7440) - Found in Apple's
older Titanium PowerBook G4 at speeds of 550, 667, and 800 MHz. This
CPU is similar to the Motorola PowerPC G4 found in Apple's fastest desktops
except it has low power capapbilities and it does not have a backside
L3 cache.
The 667 and 800 MHz Powerbook has a 133 MHz system bus, while the 550
MHz model has a 100 MHz bus.
Apple PowerPC G4 (Motorola 7410) - Found in Apple's
older Titanium Powerbook G4, the core of these notebooks is the PowerPC
G4, 400 or 500 MHz processor, with Velocity Engine.
Per Apple, "With speeds of up to 500MHz, the PowerBook G4 packs
a tremendous punch, crunching through digital video and rendering huge
Photoshop files faster than ever before. And the 100MHz system bus —
the pipeline between memory and processor — and the 1MB of backside
level 2 cache with speeds of up to 250MHz make significant performance-enhancing
contributions as well."
"But unlike PC notebooks that either shed features or compromise
performance (or both) to achieve modest weight reductions, the PowerBook
G4 is a robust, full-featured system with everything you need to do
your best work on the move: up to 30 gigabytes of hard disk space, room
for up to 1 gigabyte of RAM, and a slot-loading DVD-ROM drive. Plus
ATI RAGE Mobility 128 graphics, FireWire, USB, PC Card slot, VGA output
and S-Video output, a built-in microphone and stereo sound output. All
that’s missing, in fact, is the excess weight."
Apple PowerPC G3 - Currently available at 800MHz
or 900MHz. PowerPC G3 processors are currently found in Apple's iBook.
All have a 512K secondary cache and 100 MHz sytem bus.
<< back laptop
buying hints >>
