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5-4 Memory
Issues
Memory related BIOS settings
Depending on the type and speed of your SDRAM memory settings will be different.
Below two types of settings will be given, one optimized for speed, and one optimized for
stability. If your system is unstable with the speed optimized settings, try increasing the IO
voltage one step. (This will have your system run out of specs, we recommend you use the
settings optimized for stabilty instead). Moving the DIMM module to another DIMM slot
may sometimes help as well. You should normally place your first SDRAM module in
DIMM3, the next in DIMM2 and so on. DIMM3 is furthest from the processor.
Settings optimized for speed
BIOS Page
Item
Setting
Advanced Chipset Features DRAM timing by SPD Disabled
Advanced Chipset Features DRAM Clock
100MHz for PC-100
133MHz for PC-133
Advanced Chipset Features SDRAM Cycle length 2 for CAS 2 PC133 SDRAM
3 for PC100 SDRAM, most
unbranded PC133 SDRAM and
PC133 CAS 3 SDRAM
Advanced Chipset Features Bank Interleave
4 bank
Advanced Chipset Features Fast R-W Turn Around Enabled
Settings optimized for stability
If your machine is experiencing stability problems and you suspect your SDRAM is the
cause of the problem, you will need to set the SDRAM on its most conservative settings.
First try:
BIOS Page
Item
Setting
Advanced Chipset Features DRAM timing by SPD
Enabled
This will force the system to use the timing as specified in the SPD EPROM on the
SDRAM module. If this does not work, use the following conservative settings:
