<s>
The	O
Radeon	B-Device
R700	I-Device
is	O
the	O
engineering	O
codename	O
for	O
a	O
graphics	B-Architecture
processing	I-Architecture
unit	I-Architecture
series	O
developed	O
by	O
Advanced	O
Micro	O
Devices	O
under	O
the	O
ATI	O
brand	O
name	O
.	O
</s>
<s>
The	O
foundation	O
chip	O
,	O
codenamed	O
RV770	O
,	O
was	O
announced	O
and	O
demonstrated	O
on	O
June	O
16	O
,	O
2008	O
as	O
part	O
of	O
the	O
FireStream	O
9250	O
and	O
Cinema	O
2.0	O
initiative	O
launch	O
media	O
event	O
,	O
with	O
official	O
release	O
of	O
the	O
Radeon	B-Device
HD	I-Device
4800	O
series	O
on	O
June	O
25	O
,	O
2008	O
.	O
</s>
<s>
This	O
article	O
is	O
about	O
all	O
products	O
under	O
the	O
brand	O
"	O
Radeon	B-Device
HD	I-Device
4000	I-Device
Series	I-Device
"	O
.	O
</s>
<s>
The	O
RV770	O
extends	O
the	O
R600	O
's	O
unified	O
shader	O
architecture	O
by	O
increasing	O
the	O
stream	B-Application
processing	I-Application
unit	O
count	O
to	O
800	O
units	O
(	O
up	O
from	O
320	O
units	O
in	O
the	O
R600	O
)	O
,	O
which	O
are	O
grouped	O
into	O
10	O
SIMD	O
cores	O
composed	O
of	O
16	O
shader	O
cores	O
containing	O
4	O
FP	O
MADD/DP	O
ALUs	B-General_Concept
and	O
1	O
MADD/transcendental	O
ALU	O
.	O
</s>
<s>
The	O
RV770	O
retains	O
the	O
R600	O
's	O
4	O
Quad	O
ROP	B-General_Concept
cluster	O
count	O
,	O
however	O
,	O
they	O
are	O
faster	O
and	O
now	O
have	O
dedicated	O
hardware-based	O
AA	O
resolve	O
in	O
addition	O
to	O
the	O
shader-based	O
resolve	O
of	O
the	O
R600	O
architecture	O
.	O
</s>
<s>
RV770	O
features	O
a	O
256-bit	O
memory	O
controller	O
and	O
is	O
the	O
first	O
GPU	B-Architecture
to	O
support	O
GDDR5	O
memory	O
,	O
which	O
runs	O
at	O
900MHz	O
giving	O
an	O
effective	O
transfer	O
rate	O
of	O
3.6GHz	O
and	O
memory	O
bandwidth	O
of	O
up	O
to	O
115GB/s	O
.	O
</s>
<s>
The	O
internal	O
ring	O
bus	O
from	O
the	O
R520	B-Device
and	O
R600	O
has	O
been	O
replaced	O
by	O
the	O
combination	O
of	O
a	O
crossbar	O
and	O
an	O
internal	O
hub	O
.	O
</s>
<s>
The	O
SIP	B-Architecture
block	I-Architecture
UVD	O
2.0-2.2	O
implemented	O
on	O
the	O
dies	O
of	O
all	O
Radeon	B-Device
HD	I-Device
4000	I-Device
Series	I-Device
Desktop	O
gpus	B-Architecture
,	O
48xx	O
series	O
is	O
using	O
uvd	O
2.0	O
,	O
47xx-46xx-45xx-43xx	O
series	O
is	O
using	O
uvd	O
2.2	O
.	O
</s>
<s>
Support	O
is	O
available	O
for	O
Microsoft	B-Application
Windows	I-Application
at	O
release	O
,	O
for	O
Linux	B-Application
with	O
Catalyst	O
8.10	O
.	O
</s>
<s>
The	O
free	O
and	O
open-source	O
driver	O
requires	O
Linux	B-Application
kernel	O
3.10	O
in	O
combination	O
with	O
Mesa	B-Application
9.1	O
(	O
exposed	O
via	O
the	O
widely	O
adopted	O
VDPAU	B-Application
)	O
)	O
,	O
offering	O
full	O
hardware	O
MPEG-2	B-Algorithm
,	O
H.264/MPEG	B-Application
-4	I-Application
AVC	I-Application
and	O
VC-1	B-Operating_System
decoding	O
and	O
the	O
support	O
for	O
dual	O
video	O
streams	O
,	O
the	O
Advanced	O
Video	O
Processor	O
(	O
AVP	O
)	O
also	O
saw	O
an	O
upgrade	O
with	O
DVD	O
upscaling	O
capability	O
and	O
dynamic	O
contrast	O
feature	O
.	O
</s>
<s>
The	O
RV770	O
series	O
GPU	B-Architecture
also	O
supports	O
xvYCC	O
color	O
space	O
output	O
and	O
7.1	O
surround	O
sound	O
output	O
(	O
LPCM	B-Algorithm
,	O
AC3	O
,	O
DTS	O
)	O
over	O
HDMI	B-Protocol
.	O
</s>
<s>
The	O
RV770	O
GPU	B-Architecture
also	O
supports	O
an	O
Accelerated	O
Video	O
Transcoding	O
(	O
AVT	O
)	O
feature	O
,	O
which	O
has	O
video	O
transcoding	O
functions	O
being	O
assisted	O
by	O
the	O
GPU	B-Architecture
,	O
through	O
stream	B-Application
processing	I-Application
.	O
</s>
<s>
This	O
generation	O
of	O
dual-GPU	O
design	O
retains	O
the	O
use	O
of	O
a	O
PCI	O
Express	O
bridge	O
,	O
PLX	O
PEX	O
8647	O
with	O
a	O
power	O
dissipation	O
of	O
3.8	O
watts	O
inclusive	O
of	O
PCI	O
Express	O
2.0	O
support	O
,	O
allowing	O
two	O
GPUs	B-Architecture
on	O
the	O
same	O
PCI	O
Express	O
slot	O
with	O
doubled	O
bandwidth	O
over	O
the	O
past	O
generation	O
of	O
product	O
(	O
Radeon	B-Device
HD	I-Device
3870	O
X2	O
)	O
.	O
</s>
<s>
Subsequent	O
generations	O
of	O
dual-GPU	O
design	O
also	O
feature	O
an	O
interconnect	O
for	O
inter-GPU	O
communications	O
through	O
the	O
implementation	O
of	O
a	O
CrossFire	O
X	O
SidePort	O
on	O
each	O
GPU	B-Architecture
,	O
giving	O
extra	O
5GB/s	O
full-duplex	O
inter-GPU	O
bandwidth	O
.	O
</s>
<s>
These	O
two	O
features	O
increase	O
total	O
bandwidth	O
for	O
dual-GPU	O
designs	O
to	O
21.8GB/s	O
.	O
</s>
<s>
OpenCL	B-Application
accelerates	O
many	O
scientific	O
Software	O
Packages	O
against	O
CPU	O
up	O
to	O
factor	O
10	O
or	O
100	O
and	O
more	O
.	O
</s>
<s>
Open	B-Application
CL	I-Application
1.0	O
to	O
1.1	O
are	O
supported	O
for	O
all	O
Chips	O
with	O
RV7xx	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4850	O
was	O
announced	O
on	O
June	O
19	O
,	O
2008	O
while	O
the	O
Radeon	B-Device
HD	I-Device
4870	O
was	O
announced	O
on	O
June	O
25	O
,	O
2008	O
.	O
</s>
<s>
They	O
are	O
both	O
based	O
on	O
the	O
RV770	O
GPU	B-Architecture
,	O
packing	O
956	O
million	O
transistors	O
and	O
being	O
produced	O
on	O
a	O
55nm	O
process	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4850	O
currently	O
uses	O
GDDR3	O
memory	O
,	O
while	O
the	O
Radeon	B-Device
HD	I-Device
4870	O
uses	O
GDDR5	O
memory	O
.	O
</s>
<s>
Another	O
variant	O
,	O
the	O
Radeon	B-Device
HD	I-Device
4830	O
was	O
updated	O
on	O
October	O
23	O
,	O
2008	O
,	O
featuring	O
the	O
RV770	O
LE	O
GPU	B-Architecture
with	O
a	O
256-bit	O
GDDR3	O
memory	O
interface	O
,	O
and	O
640	O
shader	O
processors	O
.	O
</s>
<s>
Dual	O
GPU	B-Architecture
products	O
using	O
two	O
RV770	O
GPUs	B-Architecture
,	O
codenamed	O
R700	O
,	O
were	O
also	O
announced	O
.	O
</s>
<s>
One	O
product	O
named	O
Radeon	B-Device
HD	I-Device
4870	O
X2	O
,	O
featuring	O
2×1GB	O
GDDR5	O
memory	O
,	O
was	O
released	O
on	O
August	O
12	O
,	O
2008	O
,	O
while	O
another	O
dual-GPU	O
product	O
,	O
the	O
Radeon	B-Device
HD	I-Device
4850	O
X2	O
,	O
with	O
GDDR3	O
memory	O
and	O
lower	O
clock	O
speeds	O
,	O
is	O
also	O
available	O
.	O
</s>
<s>
A	O
minor	O
update	O
was	O
introduced	O
on	O
April	O
2	O
,	O
2009	O
with	O
the	O
launch	O
of	O
Radeon	B-Device
HD	I-Device
4890	O
graphics	O
cards	O
based	O
on	O
the	O
RV790	O
GPU	B-Architecture
.	O
</s>
<s>
Featuring	O
an	O
improved	O
design	O
with	O
decoupling	O
capacitors	O
to	O
reduce	O
signal	O
noise	O
,	O
altered	O
ASIC	O
power	O
distribution	O
and	O
re-timed	O
the	O
whole	O
GPU	B-Architecture
chip	O
,	O
which	O
resulted	O
in	O
a	O
slight	O
increase	O
in	O
die	O
size	O
but	O
overall	O
much	O
better	O
stability	O
at	O
high	O
clock	O
rates	O
and	O
a	O
higher	O
default	O
clock	O
.	O
</s>
<s>
On	O
August	O
18	O
,	O
2009	O
,	O
AMD	O
released	O
a	O
stripped	O
down	O
variant	O
of	O
the	O
RV790	O
GPU	B-Architecture
called	O
the	O
RV790GT	O
that	O
is	O
used	O
by	O
the	O
Radeon	B-Device
HD	I-Device
4860	O
which	O
is	O
now	O
available	O
in	O
all	O
markets	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4700	O
series	O
was	O
announced	O
on	O
April	O
28	O
,	O
2009	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4770	O
,	O
is	O
based	O
on	O
the	O
RV740	O
GPU	B-Architecture
,	O
packs	O
826	O
million	O
transistors	O
and	O
being	O
produced	O
on	O
the	O
latest	O
40nm	O
process	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4730	O
was	O
introduced	O
June	O
8	O
,	O
2009	O
,	O
unlike	O
the	O
RV740	O
based	O
Radeon	B-Device
HD	I-Device
4770	O
,	O
the	O
4730	O
is	O
a	O
stripped	O
down	O
55nm	O
RV770	O
GPU	B-Architecture
,	O
named	O
the	O
RV770CE	O
.	O
</s>
<s>
On	O
September	O
9	O
,	O
2009	O
,	O
the	O
RV740PRO	O
based	O
Radeon	B-Device
HD	I-Device
4750	O
was	O
released	O
exclusively	O
to	O
the	O
Chinese	O
market	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4750	O
is	O
based	O
on	O
the	O
40nm	O
RV740	O
of	O
the	O
Radeon	B-Device
HD	I-Device
4770	O
but	O
features	O
a	O
lower	O
clock	O
speed	O
and	O
the	O
absence	O
of	O
a	O
six-pin	O
auxiliary	O
power	O
input	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4600	O
series	O
was	O
announced	O
on	O
September	O
10	O
,	O
2008	O
.	O
</s>
<s>
All	O
variants	O
are	O
based	O
on	O
the	O
RV730	O
GPU	B-Architecture
,	O
packing	O
514	O
million	O
transistors	O
and	O
being	O
produced	O
on	O
a	O
55nm	O
process	O
.	O
</s>
<s>
More	O
recently	O
,	O
an	O
AGP	B-Architecture
version	O
of	O
the	O
4670	O
has	O
been	O
released	O
.	O
</s>
<s>
As	O
of	O
March	O
2018	O
,	O
this	O
elusive	O
AGP	B-Architecture
card	O
remains	O
among	O
the	O
last	O
cards	O
using	O
the	O
aging	O
bus	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4350	O
and	O
Radeon	B-Device
HD	I-Device
4550	O
were	O
announced	O
on	O
September	O
30	O
,	O
2008	O
,	O
both	O
based	O
on	O
the	O
RV710	O
GPU	B-Architecture
,	O
packing	O
242	O
million	O
transistors	O
and	O
being	O
produced	O
on	O
a	O
55nm	O
process	O
.	O
</s>
<s>
Model4LaunchCode	O
nameFab	O
(	O
nm	O
)	O
Transistors	O
(	O
million	O
)	O
Die	O
size	O
(	O
mm2	O
)	O
Bus	O
interfaceClock	O
rateCore	O
config1FillrateMemory2Processing	O
power(GFLOPS )	O
TDP3	O
(	O
Watts	O
)	O
Crossfire	O
supportAPI	O
support	O
(	O
version	O
)	O
Release	O
Price	O
(	O
USD	O
)	O
Core	O
(	O
MHz	O
)	O
Memory	O
(	O
MHz	O
)	O
Pixel	B-Algorithm
(	O
GP/s	O
)	O
Texture	O
(	O
GT/s	O
)	O
Size	O
(	O
MB	O
)	O
Bandwidth	O
(	O
GB/s	O
)	O
Bus	O
type	O
Bus	O
width	O
(	O
bit	O
)	O
Single	O
precision	O
Double	O
precision	O
Idle	O
Max	O
.	O
</s>
<s>
(	O
225	O
)	O
Radeon	B-Device
HD	I-Device
4890Apr	O
2	O
,	O
2009RV790	O
XT55959282PCIe	O
2.0	O
×	O
16850975800:40:1613.634.010242048124.8GDDR5256136019010.13.31.0249Radeon	O
HD	B-Device
4850	I-Device
X2Nov	O
7	O
,	O
2008R700	O
(	O
2xRV770	O
PRO	O
)	O
55956×2256×2PCIe	O
2.0	O
×	O
16625995800:40:16	O
×	O
210.0	O
×	O
225.0	O
×2512×21024×	O
263.7	O
×2GDDR3256x22000250	O
2-Way	O
Crossfire10.13.31.0339Radeon	O
HD	B-Device
4870	I-Device
X2	I-Device
Aug	O
12	O
,	O
2008	O
R700	O
(	O
2xRV770	O
XT	O
)	O
55	O
956×2	O
256×2	O
PCIe	O
2.0	O
×16	O
750	O
900	O
800:40:16	O
×2	O
12×2	O
30×2	O
1024×2	O
115.2	O
×2	O
GDDR5	O
256x2	O
2400	O
286	O
10.1	O
3.3	O
1.0	O
449Model4LaunchCode	O
nameFab	O
(	O
nm	O
)	O
Transistors	O
(	O
million	O
)	O
Die	O
size	O
(	O
mm2	O
)	O
Bus	O
interfaceClock	O
rateCore	O
config1FillrateMemory2Processing	O
power(GFLOPS )	O
TDP3	O
(	O
Watts	O
)	O
Crossfire	O
SupportAPI	O
support	O
(	O
version	O
)	O
Release	O
Price	O
(	O
USD	O
)	O
Core	O
(	O
MHz	O
)	O
Memory	O
(	O
MHz	O
)	O
Pixel	B-Algorithm
(	O
GP/s	O
)	O
Texture	O
(	O
GT/s	O
)	O
Size	O
(	O
MB	O
)	O
Bandwidth	O
(	O
GB/s	O
)	O
Bus	O
type	O
Bus	O
width	O
(	O
bit	O
)	O
Single	O
precision	O
Double	O
precision	O
Idle	O
Max	O
.	O
</s>
<s>
It	O
preferably	O
used	O
for	O
frame	B-Algorithm
buffer	I-Algorithm
.	O
</s>
<s>
AMD	O
Catalyst	O
is	O
being	O
developed	O
for	O
Microsoft	B-Application
Windows	I-Application
and	O
Linux	B-Application
.	O
</s>
<s>
This	O
may	O
be	O
different	O
for	O
the	O
AMD	B-Application
FirePro	I-Application
brand	O
,	O
which	O
is	O
based	O
on	O
identical	O
hardware	O
but	O
features	O
OpenGL-certified	O
graphics	O
device	O
drivers	O
.	O
</s>
<s>
AMD	O
Catalyst	O
supports	O
all	O
features	O
advertised	O
for	O
the	O
Radeon	B-Device
brand	O
.	O
</s>
<s>
The	O
Radeon	B-Device
HD	I-Device
4000	I-Device
series	I-Device
has	O
been	O
transitioned	O
to	O
legacy	O
support	O
,	O
where	O
drivers	O
will	O
be	O
updated	O
only	O
to	O
fix	O
bugs	O
instead	O
of	O
being	O
optimized	O
for	O
new	O
applications	O
.	O
</s>
<s>
The	O
free	O
and	O
open-source	O
drivers	O
are	O
primarily	O
developed	O
on	O
Linux	B-Application
and	O
for	O
Linux	B-Application
,	O
but	O
have	O
been	O
ported	O
to	O
other	O
operating	O
systems	O
as	O
well	O
.	O
</s>
<s>
The	O
free	O
and	O
open-source	O
"	O
Radeon	B-Device
"	O
graphics	O
driver	O
supports	O
most	O
of	O
the	O
features	O
implemented	O
into	O
the	O
Radeon	B-Device
line	O
of	O
GPUs	B-Architecture
.	O
</s>
<s>
The	O
free	O
and	O
open-source	O
"	O
Radeon	B-Device
"	O
graphics	O
device	O
drivers	O
are	O
not	O
reverse	O
engineered	O
,	O
but	O
based	O
on	O
documentation	O
released	O
by	O
AMD	O
.	O
</s>
