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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

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AMD Athlon 6 Specifiche Pagina 82