"Spread spectrum (modulation)
Set this to disabled. This has to do with EMC (Electro-Magnetic Compatibility) testing. As a result you shouldn't need to enable it at all. Unless, you get intereference as a result. This is similar to radio signals affecting unshielded speakers. Setting this to enabled varies the bus speed a little so that system doesn't emit intereference at the same frequency. This affects performance however.
Auto detect DIMM/PCI clk
This function is similar to the Smart Clock option of the Spread Spectrum function. The BIOS monitors the AGP, PCI and SDRAM's activity. If there are no cards in those slots, the BIOS turns off the appropriate AGP, PCI or SDRAM clock signals. And when there's no activity in occupied AGP / PCI / SDRAM slots, the BIOS turns off those clock signals as well. This way, EMI (Electromagnetic Interference) can be reduced without compromising system stability. This also allows the computer to reduce power consumption because only components that are running will use power. Still, if you do not have any EMI problem, leave the setting at Disabled for optimal system stability and performance. Enable it only if you are plagued by EMI or if you want to save more power."
I got this at http://www.anomic.net/bios/bios.html
funny default is on, but it is suggested that I turn them both off in cpu bios setting to improve performance.
Set this to disabled. This has to do with EMC (Electro-Magnetic Compatibility) testing. As a result you shouldn't need to enable it at all. Unless, you get intereference as a result. This is similar to radio signals affecting unshielded speakers. Setting this to enabled varies the bus speed a little so that system doesn't emit intereference at the same frequency. This affects performance however.
Auto detect DIMM/PCI clk
This function is similar to the Smart Clock option of the Spread Spectrum function. The BIOS monitors the AGP, PCI and SDRAM's activity. If there are no cards in those slots, the BIOS turns off the appropriate AGP, PCI or SDRAM clock signals. And when there's no activity in occupied AGP / PCI / SDRAM slots, the BIOS turns off those clock signals as well. This way, EMI (Electromagnetic Interference) can be reduced without compromising system stability. This also allows the computer to reduce power consumption because only components that are running will use power. Still, if you do not have any EMI problem, leave the setting at Disabled for optimal system stability and performance. Enable it only if you are plagued by EMI or if you want to save more power."
I got this at http://www.anomic.net/bios/bios.html
funny default is on, but it is suggested that I turn them both off in cpu bios setting to improve performance.
