Try this (from here
If you are not interested in overclocking, the default settings will be fine with a few exceptions described below.
If you don't use the onboard video, select
Advanced Chipset Features > OnChip and PCIe VGA selection: [Disable Onchip VGA if have PCIe VGA]
because otherwise part of the physical memory will be locked for the onboard video whether you actually connect a display to it or not.
Advanced Chipset Features > CPU to NB Frequency: [800 MHz] or [1000 MHz]
Advanced Chipset Features > NB to SB Frequency: [800 MHz] or [1000 MHz]
The performance of the onboard video will degrade significantly if these values are lower than 800 MHz. Note that [400 MHz] is the default value in some versions of BIOS.
If your memory is "performance" RAM, then you may need to raise DDR Voltage slightly for the system to run stably. Check the specifications of your memory. To change DDR voltage, go to
Cell menu > Voltage control > Adjust DDR Voltage (V)
and use the + or - key to increase or decrease the value.
Edited by Amazing Andrew, 01 February 2007 - 12:57 AM.