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Question (Q&A-59|212): I'm using 4 GB system memory under Windows® XP Professional x64 Edition. Why can't I enable hibernation in the Power Option of Control Panel? It does not have hibernation tab in it!(11/5/2007)
Answer:Windows® XP Professional x64 Edition does not support hibernation with more than 4GB system memory. Please refer to the Microsoft® Knowledge Base for details: http://support.microsoft.com/kb/888575