From the Abit IT5H manual.

"According to the standards defined by JEDEC, there are a lot of different
types of specifications for 168-pin DIMM sockets. here are the possible
types:
3.3V Unbuffered DIMM
3.3V Buffered DIMM
5V Unbuffered DIMM
5V Buffered DIMM

The types of DIMM modules differ not only by the electrical design, but
also by their architecture. So, if you buy different types of DIMM modules,
you will not be able to insert them in the DIMM sockets. Currently, the
standard for PC is 3.3V Unbuffered DIMM, which is the standard supported by
this series".

HTH,

Jose



Twin*.*Star wrote:

> I say again. Some boards will mix SIMMs and DIMMs (the Soyo boards I
> use do) but that is only for same voltage, i.e. the DIMMs must be of
> the EDO variety which then use the same 5v as the EDO SIMMs. If you
> want to use SDRAM DIMMs, then you must set you mobo to 3.3 v or you run
> the possibility (probability) of damage and/or lockups.
>
> Again, DIMMs come it two varieties, EDO which is set for 5 v and SDRAM
> which is set for 3.3 v. So if your mobo can use a mix of DIMMs and
> SIMMs, it does so if BOTH are EDO, not a mixture of EDO and SDRAM.
>
> Daniel Wysocki
> Twin*.*Star Computers
> 770-498-2582 / 800-816-0663
> Fast, Reliable, Wallet-Friendly
> [log in to unmask]

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