<s>
AMD	B-Application
Steamroller	I-Application
Family	O
15h	O
is	O
a	O
microarchitecture	B-General_Concept
developed	O
by	O
AMD	O
for	O
AMD	B-Architecture
APUs	I-Architecture
,	O
which	O
succeeded	O
Piledriver	O
in	O
the	O
beginning	O
of	O
2014	O
as	O
the	O
third-generation	O
Bulldozer-based	O
microarchitecture	B-General_Concept
.	O
</s>
<s>
Steamroller	B-Application
APUs	O
continue	O
to	O
use	O
two-core	O
modules	O
as	O
their	O
predecessors	O
,	O
while	O
aiming	O
at	O
achieving	O
greater	O
levels	O
of	O
parallelism	O
.	O
</s>
<s>
Steamroller	B-Application
still	O
features	O
two-core	O
modules	O
found	O
in	O
Bulldozer	O
and	O
Piledriver	O
designs	O
called	O
clustered	O
multi-thread	O
(	O
CMT	O
)	O
,	O
meaning	O
that	O
one	O
module	O
is	O
marketed	O
as	O
a	O
dual-core	O
processor	O
.	O
</s>
<s>
The	O
focus	O
of	O
Steamroller	B-Application
is	O
for	O
greater	O
parallelism	O
.	O
</s>
<s>
Steamroller	B-Application
,	O
the	O
microarchitecture	B-General_Concept
for	O
CPUs	O
,	O
as	O
well	O
as	O
Graphics	B-Architecture
Core	I-Architecture
Next	I-Architecture
,	O
the	O
microarchitecture	B-General_Concept
for	O
GPUs	O
,	O
are	O
paired	O
together	O
in	O
the	O
APU	O
lines	O
to	O
support	O
features	O
specified	O
in	O
Heterogeneous	B-Architecture
System	I-Architecture
Architecture	I-Architecture
.	O
</s>
<s>
On	O
21	O
September	O
2011	O
,	O
leaked	O
AMD	O
slides	O
indicated	O
that	O
this	O
third	O
generation	O
of	O
Bulldozer	O
core	O
was	O
codenamed	O
Steamroller	B-Application
.	O
</s>
<s>
In	O
2015	O
and	O
2016	O
new	O
models	O
with	O
two	O
to	O
four	O
enhanced	O
Steamroller	B-Application
B	O
cores	O
were	O
released	O
as	O
Kaveri-refresh	O
/	O
Godavari	O
.	O
</s>
<s>
Announced	O
in	O
2013	O
by	O
AMD	O
the	O
Berlin	O
APU	O
were	O
targeted	O
at	O
the	O
enterprise	O
and	O
server	O
markets	O
featuring	O
four	O
Steamroller	B-Application
cores	O
,	O
up	O
to	O
512	O
stream	O
processors	O
and	O
support	O
for	O
ECC	B-General_Concept
memory	I-General_Concept
.	O
</s>
<s>
In	O
November	O
2013	O
AMD	O
confirmed	O
it	O
would	O
not	O
update	O
the	O
FX	B-Device
series	I-Device
in	O
2014	O
,	O
neither	O
its	O
Socket	O
AM3+	O
version	O
,	O
nor	O
will	O
it	O
receive	O
a	O
Steamroller	B-Application
version	O
with	O
a	O
new	O
socket	O
.	O
</s>
<s>
However	O
,	O
plans	O
for	O
Steamroller	B-Application
Opteron	O
products	O
were	O
cancelled	O
,	O
likely	O
due	O
to	O
the	O
poor	O
energy	O
efficiency	O
achieved	O
in	O
this	O
generation	O
of	O
the	O
Bulldozer	O
architecture	O
.	O
</s>
<s>
Energy	O
efficiency	O
was	O
greatly	O
increased	O
in	O
the	O
following	O
generation	O
,	O
Excavator	O
,	O
which	O
exceeded	O
Jaguar	O
in	O
performance	O
per	O
watt	O
,	O
and	O
approximately	O
doubled	O
performance/watt	O
over	O
Steamroller	B-Application
(	O
for	O
example	O
20.74	O
pt/W	O
vs	O
10.85	O
pt/W	O
when	O
comparing	O
similar	O
mobile	O
APUs	O
using	O
rough	O
arbitrary	O
metrics	O
)	O
.	O
</s>
