Windows reports 4 processors?

[Randel Fuller]

I have a new Proliant with Dual Xeon processors, but when I look in Windows MMC or in Task Manager, it shows 4 processors instead of 2. What is up with this?

[Randel Fuller]

Should have read on further, I found the answer to this question a couple of pages down. The Xeon uses hyperthread which causes it to appear to windows as 2 processors.

[Juan Carlos Ramirez]

The new Intel XeonTM processors incorporate Intel's Hyper-Threading Technology, which makes one physical processor look like two logical processors to the OS and applications. These two 'logical' processors on a single physical processor can execute different tasks simultaneously using shared hardware resources. By allowing the processor to use on-die resources that would otherwise have been idle, Hyper-Threading Technology provides a performance boost on multi-threading and multi-tasking operations. Not all operating systems take advantage of the XeonTM Hyper-Threading features.

http://h18004.www1.hp.com/products/servers/technology/hyper-threading.html