Enable/Disable Hyperthreading from Command Line on Dell Servers

To Enable Hyperthreading, open a command prompt, and navigate to the following directory:

For 32-bit Systems:  C:\Program Files\Dell\SysMgt\oma\bin
For 64-bit Systems: C:\Program Files (x86)\Dell\SysMgt\oma\bin

Run the following command to DISABLE Hyperthreading:

omconfig chassis biossetup attribute=cpuht setting=disable

Run the following command to ENABLE Hyperthreading:
omconfig chassis biossetup attribute=cpuht setting=enable

A reboot is then required for the setting to take effect.  To see if Hyperthreading is enabled, open up Task Manager, click on the Performance tab, and the number of cores should now be doubled under the CPU Usage section.  So, for a Single Hex-Core processor, you should now see a total of 12 CPU's if it's enabled.  If you only see 6, it's disabled.