Windows 2003 SBS Says I have more than two processors, but I only have two.

Posted on 2006-03-22
Last Modified: 2012-06-27
Today I installed Windows 2003 SBS on a Dell Poweredge 2650 server with two Xeon 3 gHz processors.   The SBS installation program issues a warning:

This computer has more than two processors.  It goes on to warn that it will not use more than two processors.

According to the BIOS setup (and to my physical inspection) the server has only two processors.

This is the second Dell Poweredge on which I've observed this problem.


(1) Why does SBS see more than two processors when there are, in fact, only two?

(2) Will it use both processors?
Question by:ejfiedler

    Author Comment

    I found this on the Microsoft website:

    (1) It reads dual core processors as being two separate processors, hence my systems have looked like four.

    (2) It will use both processors.

    For more info see:;en-us;909382
    LVL 95

    Accepted Solution

    You are wrong.  And you are correct.  The 2650 is not a Dual Core system - it IS a HYPER-THREADED System.  HyperThreading is also viewed as two CPUs per PHYSICAL single CPU.  The problem WILL appear with a Dual Core CPU as well (as noted in the article).  Further, as noted in the article, two Dual Core, Hyper-Threaded CPUs will be seen as 8 TOTAL CPUs and SBS will use all 8.

    Expert Comment

    ignore the warning. Hyperthreading is turned on and the OS sees it as 4 processors. It will drive on happily despite the warning

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