AMD has informed Sun about an issue [1] that may occur in a limited number of single-core AMD Opteron(TM) x52 (2.6 GHz) and x54 (2.8 GHz) microprocessors. AMD reports that a small number of these processors manufactured in 2005 and early 2006 have been observed to produce inconsistent results in a non-production synthetic test environment with the convergence of the following three simultaneous conditions:

1. The running of floating point-intensive code sequences (note: observed only in a synthetic test environment)
2. elevated CPU temperatures, and
3. elevated ambient temperatures.

Per AMD, this issue was not observed by them on AMD Opteron x52 and x54 systems running commercially available applications, including Web servers, application servers, transaction processing servers, database servers or file print servers.

[1] For a technical description of the AMD Opteron Processor issue please see AMD's web site at http://www.amd.com/opteron/productionnotice

The only Sun platforms implicated by AMD's Production Notice would be the following:

x86 Platform

• Sun Ultra 20 (with CPU Models 152 (2.6GHz) and 154 (2.8GHz))
• Sun Ultra 40 (with CPU Models 252 (2.6GHz) and 254 (2.8GHz))
• Sun W2100z (with CPU Module 252 (2.6 GHz))
• Sun Fire V20z (with CPU Module 252 (2.6 GHz))
• Sun Fire V40z (with CPU Modules 852 (2.6 GHz) and 854 (2.8GHz))
• Sun Fire X2100 (with CPU Modules 152 (2.6GHz) and 154 (2.8GHz))
• Sun Fire X4100, and X4200 Systems (with CPU Modules 252 (2.6 GHz) and 254 (2.8 GHz))

Environmental Conditions

Sun has been informed that the affected processors may produce inconsistent results in the presence of three specific conditions occurring simultaneously:

• The execution of floating point-intensive code sequences (This has been observed only in synthetic test environments by AMD).
• Elevated CPU temperatures
• Elevated ambient temperatures

Notes:

1. Due to the nature of the described issue, AMD believes this issue is not operating system dependent.
2. AMD states that the AMD Opteron Dual-Core platforms are not affected, nor other models of Single-Core Processors.
3. Sun believes that AMD's Production Notice only implicates a small percentage of systems fitted with x52 and x54 AMD Opteron processors.

AMD asserts that should the described issue occur, there will be no indications that the Opteron processor has produced inconsistent results.

Because this issue could manifest itself in various ways, it is advisable to contact your Sun Services representative to determine the proper course of action. Sun is working closely with AMD to quickly identify and contact customers who have products containing AMD Opteron models x52 and x54 parts that could be implicated by AMD's Production Notice to properly identify any parts that may be affected, and to replace them at no charge and in the most expeditious way through Sun's world wide service organization.

A URL has been provided by AMD to answer Frequently Asked Questions (FAQs) at the following website:

• http://www.amd.com/opteron/productionnotice

Please contact your local Sun Services Representative and reference this document to determine the appropriate Field Change Order (FCO) and appropriate action to take for remediation of this issue.

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