AMD Richland

18 AMD “RICHLAND” APU | HOT CHIPS 25 | PRAVEEN DONGARA | AUGUST 2013
ADDITIONAL BOOST PSTATE
We added additional operating points to enable more optimal
power/frequency pairing and greater overall efficiency.
Pi
Pj
PNew
Power
Frequency
Y
These new operating points are designed to enable the core to improve the power manager’s ability to
settle on the optimal operating point and deliver the right performance for each workload.
Activity from
Cac Monitors
Power
Calculation
Temp.
Calculation
P
calculated
Freq
V
T
calc
T
calc
<>
Max
Temp.?
Limit
P0
P1
Pboost2
...
If T
calc
< Limit  raise F,V
If T
calc
> Limit  lower F,V
New Operating F, V
T
calculated
Temp.
of other
TEs
*
Pboost1
Pboost0
Add’l boost state
Boost Scalar
cTDP Scalar