Asus P6TD Deluxe - Manual (Page 93)

ASUS P6TD Deluxe 3-21
3.4.22 CPU Spread Spectrum [Auto]
Set to [Disabled] to enhance BCLK overclocking ability or [Auto] for EMI control.
Configuration options: [Auto] [Disabled] [Enabled]
3.4.23 IOH Clock Skew [Auto]
Adjusting this item may help enhancing BCLK overclocking ability. You may need
to adjust the CPU Clock Skew item at the same time.
Configuration options: [Auto] [Normal] [Delay 100ps]–[Delay 1500ps]
3.4.24 PCIE Spread Spectrum [Auto]
Set to [Disabled] to enhance PCIE overclocking ability or [Auto] for EMI control.
Configuration options: [Auto] [Disabled] [Enabled]