I have a Dell Precision Workstation with Windows XP SP2 and 2 Xeon CPU's and am only seeing 1 processor in the task manager graph.
So far I have checked the following:
Bios sees 2 processors (0 and 1)
Hyperthreading is turned OFF in the bios. (recommended by the manufacturer of a software package we use)
Device manager under Computer shows ACPI Multiprocessor PC
Device manager under Processors shows 2 processors
Task Manager/Performance/View/CPU History/One Graph All CPU's shows 1 graph
Task Manager/Performance/View/CPU History/One Graph Per CPU shows 1 graph
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