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SUPER P6DBS/P6DBE/P6DBU/P6SBU/P6SBS/P6SBA/P6SBM Manual
3-3 Frequently Asked Questions
Question: I have a large IDE hard drive but it's only recognized as being
8 GB in size when I let the BIOS auto detect it. What's wrong?
Answer: The auto detect feature in WinBIOS only shows hard drives as having
a maximum capacity of 8 GB. This is a BIOS limitation, but will not impact your
system. If you go to the information status table, you will see that the correct
size of your hard disk drive has been recognized.
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 sup-
ports 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
DIMMs are not recommended for running at 100 MHz bus speed.
1. Mixing ECC and non-ECC memory will result in non-ECC operation.
EC/ECC is supported by the 440BX only if all the memory is 72 bits wide.
A system with a mixture of 64 and 72-bit wide memory will disable the
ECC mode.
2. EDO memory and SDRAM cannot be mixed.
3. Registered SDRAM and unbuffered SDRAM cannot be mixed.
4. Mixing PC/100 DIMMs with PC/66 DIMMs will result in an unexpected
memory count or system errors.
5. The user should populate the DIMMs starting with the DIMM slot located
farthest 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 to 66 MHz only.
Question: How do I update my BIOS?
Answer: It is recommended that you do not upgrade your BIOS if you are
experiencing no problems with your system. Updated BIOS files are located on
our web site at http://www.supermicro.com. Please check our BIOS warning
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