Specifications

82 Product Errata
25759 Rev. 3.79 July 2009
Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors
124 STPCLK Throttling Causes Violation of VDD_ac Specification
on Some Dual-Core Processors
Description
STPCLK throttling during maximum power consumption operation generates large load steps and
voltage transients that can violate the transient voltage specification (VDD_ac). This problem is
exposed on 4-layer motherboards with single power and ground planes when the core frequency is
>2000 MHz.
Potential Effect on System
Violation of the VDD_ac specification leading to unpredictable operation.
Suggested Workaround
Do not enable STPCLK throttling on affected dual-core processors above 2000 MHz.
Fix Planned
No