<s>
The	O
Power	B-Device
Mac	I-Device
G4	I-Device
is	O
a	O
series	O
of	O
personal	B-Device
computers	I-Device
designed	O
,	O
manufactured	O
,	O
and	O
sold	O
by	O
Apple	O
Computer	O
from	O
1999	O
to	O
2004	O
as	O
part	O
of	O
the	O
Power	B-Device
Macintosh	I-Device
line	O
.	O
</s>
<s>
Built	O
around	O
the	O
PowerPC	B-General_Concept
G4	I-General_Concept
series	O
of	O
microprocessors	B-Architecture
,	O
the	O
Power	B-Device
Mac	I-Device
G4	I-Device
was	O
marketed	O
by	O
Apple	O
as	O
the	O
first	O
"	O
personal	O
supercomputers	O
"	O
,	O
reaching	O
speeds	O
of	O
4	O
to	O
20	O
gigaFLOPS	O
.	O
</s>
<s>
This	O
was	O
the	O
first	O
existing	O
Macintosh	B-Device
product	O
to	O
be	O
officially	O
shortened	O
as	O
"	O
Mac	O
"	O
,	O
and	O
is	O
the	O
last	O
Mac	O
able	O
to	O
boot	O
into	O
classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
The	O
enclosure	O
style	O
introduced	O
with	O
the	O
Power	B-Device
Macintosh	I-Device
G3	I-Device
(	O
Blue	O
and	O
White	O
)	O
was	O
retained	O
through	O
the	O
entire	O
five-year	O
production	O
run	O
of	O
the	O
Power	B-Device
Mac	I-Device
G4	I-Device
,	O
albeit	O
with	O
significant	O
changes	O
to	O
match	O
Apple	O
's	O
evolving	O
industrial	O
design	O
and	O
to	O
accommodate	O
increasing	O
cooling	O
needs	O
.	O
</s>
<s>
The	O
G4	O
and	O
its	O
enclosure	O
were	O
retired	O
with	O
the	O
introduction	O
of	O
the	O
Power	B-Device
Mac	I-Device
G5	I-Device
.	O
</s>
<s>
The	O
original	O
Power	B-Device
Mac	I-Device
G4	I-Device
was	O
introduced	O
at	O
the	O
Seybold	O
conference	O
in	O
San	O
Francisco	O
on	O
August	O
31	O
,	O
1999	O
.	O
</s>
<s>
There	O
were	O
two	O
variants	O
,	O
officially	O
titled	O
Power	B-Device
Macintosh	I-Device
G4	I-Device
(	O
PCI	B-Protocol
Graphics	O
)	O
,	O
with	O
and	O
configurations	O
available	O
,	O
and	O
Power	B-Device
Mac	I-Device
G4	I-Device
(	O
AGP	B-Architecture
Graphics	O
)	O
,	O
with	O
,	O
,	O
and	O
configurations	O
.	O
</s>
<s>
The	O
PCI	B-Protocol
Graphics	O
model	O
was	O
the	O
last	O
to	O
use	O
the	O
full	O
name	O
of	O
Power	B-Device
Macintosh	I-Device
.	O
</s>
<s>
Colloquially	O
,	O
this	O
first	O
generation	O
of	O
Power	B-Device
Mac	I-Device
G4	I-Device
is	O
referred	O
to	O
as	O
"	O
Graphite	O
"	O
.	O
</s>
<s>
This	O
is	O
due	O
to	O
the	O
color	O
scheme	O
of	O
the	O
case	O
,	O
which	O
officially	O
debuted	O
with	O
the	O
Power	B-Device
Mac	I-Device
G4	I-Device
(	O
predating	O
the	O
graphite	O
iMac	O
DV	O
Special	O
Edition	O
by	O
2	O
months	O
)	O
.	O
</s>
<s>
In	O
response	O
,	O
Apple	O
reduced	O
the	O
clock	O
speed	O
of	O
the	O
processor	B-General_Concept
in	O
each	O
configuration	O
by	O
(	O
making	O
the	O
options	O
,	O
and	O
)	O
,	O
which	O
caused	O
some	O
controversy	O
because	O
they	O
did	O
not	O
lower	O
the	O
original	O
prices	O
accordingly	O
.	O
</s>
<s>
The	O
early	O
(	O
later	O
)	O
PCI-based	O
version	O
used	O
a	O
motherboard	B-Device
identical	O
to	O
the	O
one	O
used	O
in	O
Power	B-Device
Macintosh	I-Device
G3	I-Device
(	O
Blue	O
and	O
White	O
)	O
computers	O
including	O
the	O
use	O
of	O
Zero	O
Insertion	O
Force	O
(	O
ZIF	O
)	O
processors	O
sockets	O
(	O
minus	O
the	O
ADB	B-Device
port	I-Device
)	O
,	O
in	O
a	O
"	O
graphite	O
"	O
colored	O
case	O
and	O
with	O
the	O
new	O
Motorola	O
PowerPC	B-Architecture
7400	O
(	O
G4	O
)	O
CPU	O
.	O
</s>
<s>
The	O
higher-speed	O
models	O
,	O
code	O
name	O
"	O
Sawtooth	O
"	O
,	O
used	O
a	O
greatly	O
modified	O
motherboard	B-Device
design	O
with	O
AGP	B-Architecture
2x	O
graphics	O
(	O
replacing	O
the	O
PCI	B-Protocol
slot	I-Protocol
)	O
.	O
</s>
<s>
The	O
PCI	B-Protocol
variant	O
was	O
discontinued	O
at	O
the	O
end	O
of	O
1999	O
.	O
</s>
<s>
The	O
and	O
versions	O
had	O
Zip	B-Operating_System
drives	I-Operating_System
as	O
standard	O
equipment	O
,	O
and	O
as	O
an	O
option	O
on	O
the	O
Sawtooth	O
.	O
</s>
<s>
This	O
series	O
had	O
a	O
system	B-Architecture
bus	I-Architecture
and	O
four	O
PC100	O
SDRAM	O
slots	O
for	O
up	O
to	O
of	O
RAM	B-Architecture
(	O
under	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
)	O
.	O
</s>
<s>
The	O
AGP	B-Architecture
Power	B-Device
Macs	I-Device
were	O
the	O
first	O
to	O
include	O
an	O
AirPort	O
slot	O
and	O
DVI	B-Protocol
video	O
port	O
.	O
</s>
<s>
The	O
computers	O
could	O
house	O
a	O
total	O
of	O
three	O
hard	B-Device
drives	I-Device
,	O
two	O
128GB	O
ATA	B-Protocol
hard	B-Device
drives	I-Device
and	O
up	O
to	O
a	O
single	O
20GB	O
SCSI	O
hard	B-Device
drive	I-Device
,	O
with	O
the	O
installation	O
of	O
a	O
SCSI	O
card	O
.	O
</s>
<s>
DVD-RAM	O
and	O
Zip	B-Operating_System
drives	I-Operating_System
featured	O
on	O
these	O
later	O
and	O
versions	O
and	O
were	O
an	O
option	O
on	O
the	O
400MHz	O
.	O
</s>
<s>
The	O
Power	B-Device
Mac	I-Device
G4	I-Device
(	O
Gigabit	O
Ethernet	O
)	O
model	O
was	O
introduced	O
at	O
Macworld	O
Expo	O
New	O
York	O
on	O
July	O
19	O
,	O
2000	O
;	O
the	O
new	O
revision	O
included	O
dual-processor	O
and	O
versions	O
,	O
and	O
a	O
low-end	O
single	O
CPU	O
model	O
.	O
</s>
<s>
It	O
was	O
also	O
the	O
first	O
personal	B-Device
computer	I-Device
to	O
include	O
gigabit	O
Ethernet	O
as	O
standard	O
.	O
</s>
<s>
Most	O
people	O
saw	O
this	O
revision	O
as	O
a	O
stopgap	O
release	O
,	O
because	O
higher	O
clocked	O
G4s	O
were	O
not	O
available	O
;	O
the	O
G4	O
's	O
Motorola	O
XPC107	O
"	O
Grackle	O
"	O
PCI/Memory	O
controller	O
prevented	O
the	O
G4	O
from	O
hitting	O
speeds	O
higher	O
than	O
.	O
</s>
<s>
The	O
dual	O
models	O
featured	O
DVD-RAM	O
optical	O
drives	O
.	O
</s>
<s>
Zip	B-Operating_System
drives	I-Operating_System
were	O
optional	O
on	O
all	O
models	O
.	O
</s>
<s>
These	O
models	O
also	O
introduced	O
Apple	O
's	O
proprietary	O
Apple	B-Protocol
Display	I-Protocol
Connector	I-Protocol
video	O
port	O
.	O
</s>
<s>
Graphite	O
variation	O
Late	O
1999	O
PCI	B-Protocol
Late	O
1999	O
AGP	B-Architecture
Mid	O
2000	O
Gigabit	O
Codename	O
"	O
Yikes	O
!	O
"	O
</s>
<s>
A	O
new	O
line	O
with	O
a	O
revamped	O
motherboard	B-Device
but	O
retaining	O
the	O
familiar	O
"	O
Graphite	O
"	O
case	O
debuted	O
on	O
January	O
9	O
,	O
2001	O
.	O
</s>
<s>
Known	O
officially	O
as	O
the	O
Power	B-Device
Mac	I-Device
G4	I-Device
(	O
Digital	O
Audio	O
)	O
,	O
it	O
is	O
in	O
effect	O
a	O
Quicksilver	O
design	O
inside	O
the	O
Graphite	O
enclosure	O
.	O
</s>
<s>
Motorola	O
had	O
added	O
a	O
seventh	O
pipeline	O
stage	O
in	O
the	O
new	O
PowerPC	B-General_Concept
G4	I-General_Concept
design	O
to	O
achieve	O
faster	O
clock	O
frequencies	O
.	O
</s>
<s>
New	O
features	O
included	O
a	O
fourth	O
PCI	B-Protocol
slot	I-Protocol
,	O
a	O
133MHz	O
system	B-Architecture
bus	I-Architecture
,	O
an	O
improved	O
4X	O
AGP	B-Architecture
slot	I-Architecture
,	O
and	O
a	O
new	O
"	O
digital	O
audio	O
"	O
Tripath	O
Class	O
T	O
amplifier	O
sound	O
system	O
.	O
</s>
<s>
The	O
models	O
were	O
offered	O
in	O
,	O
,	O
dual	O
,	O
and	O
configurations	O
,	O
the	O
latter	O
two	O
using	O
a	O
newer	O
PowerPC	B-Architecture
7450	O
processor	B-General_Concept
.	O
</s>
<s>
The	O
number	O
of	O
RAM	B-Architecture
slots	O
was	O
reduced	O
to	O
three	O
,	O
accommodating	O
up	O
to	O
1.5	O
Gigabytes	O
of	O
PC133	O
SDRAM	O
.	O
</s>
<s>
The	O
model	O
was	O
the	O
first	O
Macintosh	B-Device
to	O
include	O
a	O
built-in	O
DVD-R	O
or	O
Apple-branded	O
SuperDrive	B-Device
,	O
the	O
rest	O
of	O
the	O
line	O
became	O
the	O
first	O
Macs	O
to	O
ship	O
with	O
CD-RW	O
drives	O
.	O
</s>
<s>
The	O
SuperDrive	B-Device
was	O
offered	O
on	O
the	O
mid-range	O
model	O
,	O
and	O
UltraATA/100	O
hard	B-Device
drives	I-Device
were	O
offered	O
on	O
all	O
models	O
.	O
</s>
<s>
The	O
Quicksilver	O
line	O
received	O
criticism	O
in	O
MacWorlds	O
review	O
for	O
removing	O
the	O
"	O
eject	O
"	O
button	O
and	O
the	O
manual	O
eject	O
pinhole	O
,	O
as	O
well	O
as	O
the	O
pass-through	O
monitor	O
power	O
plug	O
,	O
and	O
for	O
the	O
base	O
specification	O
of	O
RAM	B-Architecture
as	O
being	O
insufficient	O
for	O
running	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
Updated	O
Quicksilver	O
machines	O
,	O
officially	O
named	O
Power	B-Device
Mac	I-Device
G4	I-Device
(	O
Quicksilver	O
2002	O
)	O
,	O
were	O
introduced	O
on	O
January	O
28	O
,	O
2002	O
,	O
with	O
,	O
and	O
dual	O
configurations	O
.	O
</s>
<s>
The	O
graphics	O
in	O
Updated	O
Quicksilver	O
machines	O
were	O
provided	O
by	O
an	O
Nvidia	O
GeForce4	O
Ti/MX	O
or	O
ATI	B-Device
Radeon	I-Device
7500	I-Device
graphics	B-Device
card	I-Device
.	O
</s>
<s>
Some	O
of	O
these	O
models	O
have	O
ATA	B-Protocol
controllers	O
with	O
48-bit	O
LBA	B-Device
to	O
accommodate	O
hard	B-Device
drives	I-Device
larger	O
than	O
128GB	O
.	O
</s>
<s>
Another	O
generation	O
of	O
Apple	B-Device
Power	I-Device
Mac	I-Device
G4s	O
,	O
officially	O
named	O
"	O
Mirrored	O
Drive	O
Doors	O
"	O
(	O
MDD	O
)	O
,	O
was	O
introduced	O
on	O
August	O
13	O
,	O
2002	O
,	O
featuring	O
both	O
a	O
new	O
Xserve-derived	O
DDR	O
motherboard	B-Device
architecture	O
and	O
a	O
new	O
case	O
design	O
.	O
</s>
<s>
All	O
models	O
were	O
available	O
in	O
dual	O
processor	B-General_Concept
configurations	O
running	O
at	O
,	O
or	O
.	O
</s>
<s>
As	O
with	O
the	O
Xserves	B-Device
,	O
the	O
PowerPC	B-Architecture
7455	O
CPU	O
used	O
does	O
not	O
have	O
a	O
DDR	O
frontside	B-Architecture
bus	I-Architecture
,	O
meaning	O
the	O
CPU	O
of	O
the	O
133MHz	O
frontside	B-Architecture
bus	I-Architecture
models	O
could	O
use	O
at	O
most	O
only	O
50%	O
of	O
the	O
new	O
system	O
's	O
theoretical	O
memory	B-Architecture
bandwidth	O
,	O
providing	O
no	O
improvement	O
over	O
previous	O
models	O
.	O
</s>
<s>
The	O
rest	O
was	O
available	O
to	O
the	O
graphics	B-Device
card	I-Device
and	O
I/O	B-General_Concept
systems	O
.	O
</s>
<s>
A	O
single	O
processor	B-General_Concept
model	O
would	O
be	O
the	O
last	O
Power	B-Device
Mac	I-Device
G4	I-Device
the	O
company	O
offered	O
to	O
the	O
public	O
after	O
the	O
announcement	O
of	O
the	O
new	O
Power	B-Device
Mac	I-Device
G5	I-Device
,	O
introduced	O
in	O
June	O
2003	O
.	O
</s>
<s>
The	O
last	O
real	O
update	O
to	O
the	O
Power	B-Device
Mac	I-Device
G4	I-Device
line	O
came	O
on	O
January	O
28	O
,	O
2003	O
,	O
offering	O
dual	O
1.42GHz	O
PowerPC	B-Architecture
7455	O
processors	O
,	O
with	O
features	O
not	O
seen	O
in	O
previous	O
DDR	O
models	O
:	O
a	O
built-in	O
FireWire	O
800	O
connector	O
,	O
optional	O
integrated	O
Bluetooth	B-Protocol
,	O
and	O
optional	O
integrated	O
AirPort	B-Device
Extreme	I-Device
.	O
</s>
<s>
These	O
were	O
also	O
the	O
first	O
Power	B-Device
Macs	I-Device
that	O
could	O
not	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
.	O
</s>
<s>
With	O
the	O
launch	O
of	O
the	O
Power	B-Device
Mac	I-Device
G5	I-Device
on	O
June	O
23	O
,	O
2003	O
,	O
Apple	O
re-introduced	O
the	O
August	O
2002	O
Power	B-Device
Mac	I-Device
G4	I-Device
because	O
of	O
perceived	O
demand	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
machines	O
.	O
</s>
<s>
Between	O
that	O
,	O
its	O
low	O
price-tag	O
,	O
and	O
the	O
delayed	O
availability	O
of	O
Power	B-Device
Mac	I-Device
G5s	I-Device
,	O
it	O
proved	O
a	O
strong	O
seller	O
,	O
albeit	O
for	O
a	O
relatively	O
short	O
time	O
.	O
</s>
<s>
Production	O
stopped	O
on	O
June	O
27	O
,	O
2004	O
,	O
and	O
the	O
remaining	O
inventory	O
was	O
liquidated	O
,	O
its	O
discontinuation	O
ending	O
the	O
20-year	O
legacy	O
of	O
Classic	B-Application
Mac	I-Application
OS	I-Application
support	O
.	O
</s>
