660
APERF
May
Increase
Unpredictably
Description
The
value
of
MSR
0000_00
E
8 (
APERF
)
may
increase
unpredictably
after
any
of
the
following
events
:
•
A
P-state
transition
,
including
those
performed
due
to
core
performance
boost
(
CPB
).
•
A
C-state
transition
.
•
A
change
in
the
P-state
limit
due
to
hardware
thermal
control
(
HTC
),
application
power
management
(
APM
)
or
advanced
platform
management
link
(
APML
)
TDP
limiting
.
•
Execution
of
the
MWAIT
instruction
.
Potential
Effect
on
System
Software
may
calculate
the
effective
frequency
of
a
core
incorrectly
or
observe
that
the
APERF
register
value
appears
to
increase
unpredictably
.
Suggested
Workaround
Contact
your
AMD
representative
for
information
on
a
BIOS
update
.
Fix
Planned
Yes
Revision
Guide
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
48063
Rev
. 3.18
October
2012
52
Product
Errata