MSI Z68A User Guide - Page 48

BIOS Setup ▶ Spread Spectrum When the mainboard's clock generator pulses, the extreme values (spikes) of the pulses create EMI (Electromagnetic Interference). The Spread Spectrum function reduces the EMI generated by modulating the pulses so that the spikes of the pulses are reduced to flatter curves. Important • If you do not have any EMI problem, leave the setting at [Disabled] for optimal system stability and performance. But if you are plagued by EMI, select the value of Spread Spectrum for EMI reduction. • The greater the Spread Spectrum value is, the greater the EMI is reduced, and the system will become less stable. For the most suitable Spread Spectrum value, please consult your local EMI regulation. • Remember to disable Spread Spectrum if you are overclocking because even a slight jitter can introduce a temporary boost in clock speed which may just cause your overclocked processor to lock up. ▶ VDroop Control This item is used to select the VDroop control mode. ▶ CPU Core Voltage/ CPU I/O Voltage/ DRAM Voltage/ GPU Voltage/ System Agent Voltage(SA)/ CPU PLL Voltage/ DDR_VREF_CA_A/ DDR_VREF_CA_B/ DDR_VREF_ DA_A/ DDR_VREF_DA_B/ PCH 1.05 These items are used to adjust the voltage of CPU, Memory and chipset. ▶ Current CPU Core Voltage/ Current CPU I/O Voltage/ Current DRAM Voltage/ Current GPU Voltage These items show current CPU Core/ CPU I/O/ DRAM/ GPU voltage. Read-only. ▶ Overclocking Profiles Press to enter the sub-menu. ▶ Overclocking Profile 1/ 2/ 3/ 4/ 5/ 6 Press to enter the sub-menu. In the sub-menu, these items are used to save the current settings, and you can to load the settings from the stored profile. ▶ OC Retry Count When overclocking has failed, setting this item as [1, 3] will allow system to reboot 1/ 3 times with the same overclocked configuration. If overclocking has failed every time, the system will restore the defaults. 3-10