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3-4
SUPER P6DBS/P6DBE/P6DBU/P6SBU/P6SBS/P6SBA
Manual
3-3 Frequently Asked Questions
Question: What are the differences between the various memories that
the 440BX motherboard can support?
Answer: The 440BX integrates a main memory DRAM controller that supports
a 64-bit or 72-bit (64 bit memory data plus 8 ECC bits.) DRAM from 8 MB to 512
MB for SDRAM and from 8 MB to 1 GB for EDO or registered DIMM. The DRAM
types supported are either Extended Data Out (EDO), Synchronous DRAM
(SDRAM) or Registered DIM modules. *Note: EDO DIM Modules are not
recommended for running 100 MHz bus speed.
1. Mixing ECC and non-ECC will result in non-ECC operation.
EC/ECC is supported properly in the 440BX, only if all the memory are 72 bit
wide. A system with a mixture of 64 and 72-bit wide memory will disable
ECC mode.
2. EDO memory and SDRAM cannot be mixed.
3. Registered SDRAM and unbuffered SDRAM cannot be mixed.
4. Mixing PC/100 DIMM and PC/66 DIMM will result in an unexpected
memory count or system errors.
5. User should populate the DIMM starting with the DIMM socket located
the furthest from the BX chip (U2 on P6DBS/P6DBE/P6SBS, U4 on P6DBU/
P6SBU or U9 on P6SBA).
6. If EDO memory is used, the CPU bus should be set at 66 MHz Bus
speed only.
Question: How do I update my BIOS?
Answer: Update BIOS files are located on our web site at http://
www.supermicro.com. Please check the current BIOS revision and make sure
it is newer than your BIOS before downloading. Select your motherboard model
and download the BIOS file to your computer. Unzip the BIOS update file and
you will find three files: readme.txt (flash instructions), sm2flash.com (BIOS flash
utility), and the BIOS image file (xxxxxx.rom). Copy these files onto a bootable
floppy and reboot your system. It is not necessary to set BIOS boot block
protection jumpers on the motherboard. At the DOS prompt, enter the command
"sm2flash." This will start the flash utility and give you an opportunity to save