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    <pre><code>System.Environment.ProcessorCount </code></pre> <p>returns the number of logical processors</p> <blockquote> <p><a href="http://msdn.microsoft.com/en-us/library/system.environment.processorcount.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.environment.processorcount.aspx</a></p> </blockquote> <p>For physical processor count you'd probably need to use WMI - the following metadata is supported in XP/Win2k3 upwards (Functionality enabled in SP's prior to Vista/Win2k8).</p> <blockquote> <p><b>Win32_ComputerSystem.NumberOfProcessors</b> returns physical count</p> <p><b>Win32_ComputerSystem.NumberOfLogicalProcessors</b> returns logical (duh!)</p> </blockquote> <p>Be cautious that HyperThreaded CPUs appear identical to multicore'd CPU's yet the performance characteristics are <em>very</em> different. </p> <p>To check for HT-enabled CPUs examine each instance of Win32_Processor and compare these two properties.</p> <blockquote> <p><b>Win32_Processor.NumberOfLogicalProcessors</b></p> <p><b>Win32_Processor.NumberOfCores</b></p> </blockquote> <p>On multicore systems these are typically the same the value.</p> <p>Also, be aware of systems that may have multiple <strong>Processor Groups</strong>, which is often seen on computers with a large number of processors. By default <a href="https://stackoverflow.com/questions/27965962/c-sharp-environment-processorcount-does-not-always-return-the-full-number-of-log">.Net will only using the first processor group</a> - which means that by default, threads will utilize only CPUs from the first processor group, and <code>Environment.ProcessorCount</code> will return only the number of CPUs in this group. According to <a href="https://stackoverflow.com/questions/27965962/c-sharp-environment-processorcount-does-not-always-return-the-full-number-of-log/30456753#30456753">Alastair Maw's answer</a>, this behavior can be changed by altering the app.config as follows:</p> <pre><code>&lt;configuration&gt; &lt;runtime&gt; &lt;Thread_UseAllCpuGroups enabled="true"/&gt; &lt;GCCpuGroup enabled="true"/&gt; &lt;gcServer enabled="true"/&gt; &lt;/runtime&gt; &lt;/configuration&gt; </code></pre>
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    1. COYou should note, it's supported only in XP SP3/Win2k3 and upwards.
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    2. CORick there was a hotfix for XPSP2 http://support.microsoft.com/kb/936235
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