Specifications

Product Errata 101
Revision Guide for AMD Family 10h Processors
41322 Rev. 3.84 August 2011
378 Processor May Operate at Reduced Frequency
Description
When Product Information Register F3x1FC[31] is set, the reset values of the P-State Registers
(MSRC001_00[68:64]) are not compliant with prior algorithms used to specify the P-state
frequencies. Only one P-state register has bit 63 (PstateEn) set and the CPU frequency specified by
this P-State register is below the maximum operating frequency for the processor.
Potential Effect on System
AM3 package processors may experience performance degradation when installed in an AM2r2 or
AM3 platform.
Suggested Workaround
For AM3 package processors, when F3x1FC[31] is not set, the system designer must consult the
AMD Family 10h Desktop Processor Power and Thermal Datasheet, order #43375 for correct single-
plane TDP values.
On AM2r2 and AM3 platforms, if F3x1FC[31] is set BIOS must follow the updated algorithm to
write MSRC001_00[68:64] with corrected values, as documented in revision 3.23 or later versions of
the BIOS and Kernel Developer’s Guide (BKDG) for AMD Family 10h Processors, order# 31116.
This updated algorithm is applicable only to AM2r2 and AM3 platforms, and is incompatible with
AM2 platforms.
Fix Planned
No