Apple Power Mac G5 (Late 2005) Bedienungsanleitung PDF herunterladen (Seite 11)

Technology Overview

Power Mac G5

533MHz DDR2 Main Memory

The new 128-bit memory controller in the Power Mac G5 supports DDR2 main memory

running at speeds up to 533MHz. In addition to writing data at a double rate, or twice

the rate of the clock speed, the memory controller increases e∑ ciency by reordering

read and write operations. By addressing two banks of SDRAM at the same time, the

new Power Mac G5 can reach a memory throughput of up to 8.5 GBps. That represents

a 25 percent increase over the latest Power Mac G5 and triple the throughput of the

fastest Power Mac G4.

With its 64-bit processor architecture, the Power Mac G5 can address more memory

than any previous Macintosh and many desktop PCs. All Power Mac G5 systems can

hold up to eight 2GB DIMMs for up to 16GB of memory. For users in mission-critical and

compute-intensive environments, there’s also the option of ECC (Error Correction Code)

main memory, which allows automatic correction of single-bit errors and detection of

multiple-bit errors.

This high-speed, high-capacity memory architecture enables graphics, video, audio,

and scientiﬁ c applications to run radically faster. Enormous ﬁ les and data sets can be

loaded into RAM for rapid access by the PowerPC G5—without having to access system

storage. Data can be retrieved from memory 40 times faster than from the hard drive.

In fact, accessing the ﬁ rst critical word of data from memory is 60,000 times faster

than from a hard drive, so manipulation and analysis of data can be performed at

remarkable speeds.

PCI Express Graphics

With the introduction of PCI Express architecture comes a new 16-lane PCI Express

graphics interface that supports the latest graphics controllers and delivers up to

4 GBps of data throughput. By supplying up to 150 watts of power to the primary

graphics processing unit, the new Power Mac G5 provides the headroom for high-

performance, next-generation graphics processors and applications, enabling even

higher resolutions for stunning realism.

For more information about graphics cards, Apple displays, and graphics technologies,

see the “Workstation Graphics” section.

PCI Express Expansion

The all-new PCI Express architecture allows you to customize your Power Mac G5 to

the needs of your workﬂ ow—providing tremendous power and productivity in a single

system. As your needs change, you’ll have the ﬂ exibility to add solutions for emerging

workﬂ ow scenarios, such as HD video and next-generation networking.

Modern serial expansion architecture

PCI Express is a modern industry standard sponsored by the Peripheral Component

Interconnect Special Interest Group (PCI SIG). Because older parallel technologies

placed multiple devices on a single bus, the slowest device determined the speed

of the entire bus. A serial technology, PCI Express guarantees each device dedicated

bandwidth to and from the system controller.

PCI Express communicates in 250-MBps “data lanes.” PCI Express cards and slots are

deﬁ ned by their bandwidth, or number of data lanes—typically one lane, four lanes,

eight lanes, or 16 lanes. At 250 MBps per lane, a four-lane slot can transfer data at

up to 1 GBps and an eight-lane slot, up to 2 GBps—approximately twice as fast as a

133MHz PCI-X slot.

Up to 25 percent faster

memory throughput

With support for DDR2 memory, data

throughput on the new Power Mac G5

is 25 percent faster than previous Power

Mac G5 models and up to three times

faster than the Power Mac G4.

6.4 GBps

2.7 GBps

128-bit DDR2

at 533MHz

8.5 GBps

128-bit DDR

at 400MHz

64-bit DDR

at 333MHz

Almost twice the graphics throughput

The 16-lane PCI Express graphics interface

increases throughput to up to 4 GBps,

almost double that of AGP 8X in previous

Power Mac G5 models.

2.1 GBps

16-lane

PCI Express

4 GBps

AGP 8X

Up to twice the PCI throughput

PCI Express delivers a radical increase in

throughput compared with the expansion

technologies on previous Power Mac G5

systems (PCI-X and PCI) and Power Mac G4

systems (PCI).

1 GBps

0.25 GBps

Eight-lane

PCI Express

2 GBps

Four-lane

PCI Express

PCI-X 64-bit,

133MHz

PCI 64-bit,

33MHz

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 32 33

Kommentare zu diesen Handbüchern

Keine Kommentare

Apple Power Mac G5 (Late 2005) Bedienungsanleitung Seite 11

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Computers Apple Power Mac G5 (Late 2005)