NEC ExpressA1160 - Manual (Page 162)

Analyzing Processor Sockets and Cores
8-12
Figure 8-3 BIOS Core Selection Window
7. Use the controls to select each core that you want to disable, and press the
spacebar.
A blank replaces the X, meaning that the core is disabled.
8. When you are finished disabling cores for the cell, press F10 to save changes.
9. Press Esc to exit the BIOS Setup and return to the BIOS front page.
10. Select Continue and press Enter.
A dialog box asking if you want to reboot appears.
11. Press Enter to select Yes to reboot the partition.
When the boot process completes, the specified cores are disabled.