<s>
Kentsfield	B-Device
is	O
the	O
code	O
name	O
of	O
the	O
first	O
Intel	O
desktop	O
Core	B-Device
2	I-Device
Quad	I-Device
and	O
quad-core	B-Device
Xeon	I-Device
CPUs	O
,	O
released	O
on	O
November	O
2	O
,	O
2006	O
.	O
</s>
<s>
The	O
top-of-the-line	O
Kentsfields	B-Device
were	O
Core	B-Device
2	I-Device
Extreme	O
models	O
numbered	O
QX6x00	O
,	O
while	O
the	O
mainstream	O
Core	B-Device
2	I-Device
Quad	I-Device
models	O
were	O
numbered	O
Q6x00	O
.	O
</s>
<s>
All	O
of	O
them	O
featured	O
two	O
4MiB	O
L2	O
caches	B-General_Concept
.	O
</s>
<s>
The	O
mainstream	O
65	O
nanometer	O
Core	B-Device
2	I-Device
Quad	I-Device
Q6600	O
,	O
clocked	O
at	O
2.4GHz	O
,	O
was	O
launched	O
on	O
January	O
8	O
,	O
2007	O
at	O
US$851	O
(	O
reduced	O
to	O
US$530	O
on	O
April	O
7	O
,	O
2007	O
)	O
.	O
</s>
<s>
July	O
22	O
,	O
2007	O
marked	O
the	O
release	O
of	O
the	O
Core	B-Device
2	I-Device
Quad	I-Device
Q6700	O
and	O
Core	B-Device
2	I-Device
Extreme	O
QX6850	O
Kentsfields	B-Device
at	O
US$530	O
and	O
US$999	O
respectively	O
;	O
the	O
price	O
of	O
the	O
Q6600	O
was	O
later	O
reduced	O
to	O
US$266	O
.	O
</s>
<s>
Both	O
Kentsfield	B-Device
and	O
Kentsfield	B-Device
XE	O
use	O
product	O
code	O
80562	O
.	O
</s>
<s>
Analogous	O
to	O
the	O
Pentium	B-Device
D	I-Device
branded	O
CPUs	O
,	O
the	O
Kentsfields	B-Device
comprise	O
two	O
separate	O
silicon	O
dies	O
(	O
each	O
equivalent	O
to	O
a	O
single	O
Core	B-Device
2	I-Device
Duo	O
)	O
on	O
one	O
MCM	B-Algorithm
.	O
</s>
<s>
This	O
results	O
in	O
lower	O
costs	O
,	O
but	O
a	O
lesser	O
share	O
of	O
the	O
bandwidth	O
from	O
each	O
of	O
the	O
CPUs	O
to	O
the	O
northbridge	B-Device
than	O
if	O
the	O
dies	O
were	O
each	O
to	O
sit	O
in	O
separate	O
sockets	O
as	O
is	O
the	O
case	O
for	O
the	O
AMD	O
Quad	O
FX	O
platform	O
.	O
</s>
<s>
As	O
might	O
be	O
predicted	O
from	O
the	O
two-die	O
MCM	B-Algorithm
configuration	O
,	O
the	O
thermal	B-General_Concept
design	I-General_Concept
power	I-General_Concept
of	O
the	O
Kentsfield	B-Device
(	O
QX6800	O
-	O
130watts	O
,	O
</s>
<s>
)	O
is	O
double	O
that	O
of	O
its	O
similarly	O
clocked	O
Core	B-Device
2	I-Device
Duo	O
counterpart	O
.	O
</s>
<s>
The	O
multiple	B-Architecture
cores	I-Architecture
of	O
the	O
Kentsfield	B-Device
mostly	O
benefits	O
applications	O
that	O
can	O
easily	O
be	O
broken	O
into	O
a	O
small	O
number	O
of	O
parallel	O
threads	B-Operating_System
(	O
such	O
as	O
audio	O
and	O
video	B-Algorithm
transcoding	I-Algorithm
,	O
data	B-General_Concept
compression	I-General_Concept
,	O
video	O
editing	O
,	O
3D	O
rendering	O
and	O
ray-tracing	B-Algorithm
)	O
.	O
</s>
<s>
To	O
take	O
a	O
specific	O
example	O
,	O
multi-threaded	B-Operating_System
games	O
such	O
as	O
Crysis	B-Application
and	O
Gears	B-Application
of	I-Application
War	I-Application
which	O
must	O
perform	O
multiple	O
simultaneous	O
tasks	O
such	O
as	O
AI	O
,	O
audio	O
and	O
physics	O
benefit	O
from	O
quad-core	B-Architecture
CPUs	O
.	O
</s>
<s>
To	O
return	O
to	O
the	O
above	O
example	O
,	O
some	O
tests	O
have	O
demonstrated	O
that	O
Crysis	B-Application
fails	O
to	O
take	O
advantage	O
of	O
more	O
than	O
two	O
cores	O
at	O
any	O
given	O
time	O
.	O
</s>
<s>
There	O
is	O
still	O
,	O
however	O
,	O
some	O
overhead	O
involved	O
in	O
coordinating	O
execution	O
of	O
multiple	O
processes	O
or	O
threads	B-Operating_System
and	O
scheduling	O
them	O
on	O
multiple	O
CPUs	O
which	O
scales	O
with	O
the	O
number	O
of	O
threads/CPUs	O
.	O
</s>
<s>
The	O
first	O
Kentsfield	B-Device
XE	O
processor	O
,	O
the	O
Core	B-Device
2	I-Device
Extreme	O
QX6700	O
(	O
product	O
code	O
80562	O
)	O
with	O
a	O
clock	O
speed	O
of	O
2.67GHz	O
,	O
was	O
released	O
on	O
November	O
2	O
,	O
2006	O
at	O
US$999	O
.	O
</s>
<s>
It	O
featured	O
the	O
Kentsfield	B-Device
XE	O
core	B-Device
and	O
complemented	O
the	O
Core	B-Device
2	I-Device
Extreme	O
X6800	O
dual-core	B-Architecture
processor	I-Architecture
based	O
on	O
the	O
Conroe	O
XE	O
core	B-Device
.	O
</s>
<s>
Similarly	O
to	O
the	O
previous	O
dual-core	B-Architecture
Extreme	O
processors	O
,	O
CPUs	O
with	O
the	O
Kentsfield	B-Device
XE	O
core	B-Device
had	O
unlocked	O
multipliers	O
.	O
</s>
<s>
The	O
Core	B-Device
2	I-Device
Extreme	O
QX6800	O
clocked	O
at	O
2.93GHz	O
was	O
released	O
on	O
April	O
8	O
,	O
2007	O
,	O
at	O
US$	O
1,199	O
.	O
</s>
<s>
It	O
had	O
a	O
130W	O
TDP	B-General_Concept
thermal	O
envelope	O
,	O
and	O
was	O
intended	O
for	O
high	O
end	O
OEM-only	O
systems	O
.	O
</s>
<s>
The	O
Core	B-Device
2	I-Device
Extreme	O
QX6850	O
clocked	O
at	O
3.0GHz	O
was	O
launched	O
on	O
July	O
22	O
,	O
2007	O
,	O
at	O
US$999	O
.	O
</s>
<s>
It	O
featured	O
a	O
faster	O
1333MT/s	O
FSB	B-Architecture
.	O
</s>
<s>
Simultaneously	O
,	O
the	O
previously	O
available	O
Core	B-Device
2	I-Device
Extreme	O
QX6700	O
had	O
its	O
price	O
reduced	O
.	O
</s>
<s>
The	O
dual-core	B-Architecture
desktop	O
version	O
of	O
Kentsfield	B-Device
is	O
Conroe	O
.	O
</s>
<s>
The	O
server	O
versions	O
of	O
Kentsfield	B-Device
are	O
the	O
dual-processor	O
Clovertown	B-Device
(	O
Xeon	B-Device
53xx	O
)	O
and	O
the	O
multi-processor	O
Tigerton	O
(	O
Xeon	B-Device
73xx	O
)	O
.	O
</s>
<s>
Kentsfield	B-Device
was	O
replaced	O
by	O
the	O
45nm	O
Yorkfield	B-Device
processor	O
.	O
</s>
