FREQUENTLY ASKED QUESTIONS
Last updated: 9/25/00
Q. What is a SIMM?
A. A Single In-line Memory Module or SIMM
is a small printed circuit board containing memory chips (DRAMs). Most
SIMMs have 30 or 72 pins (which are actually printed circuit contacts and
not pins). 30-pin SIMMs come in 8-bit (non-parity) or 9-bit (parity). 72-pin
SIMMs are generally available in 32-bit (non-parity) or 36-bit (parity)
Q. What is a DIMM?
A. A Dual In-line Memory Module or DIMM combines
two 72-pin SIMMS into a 168-pin module with 64-bit (non-parity) or 72-bit
(parity) data paths.
Q. Will PC133 or PC100 memory work on a motherboard
that has a 66 Mhz Front Side Bus (FSB)?
A. Let me answer that with a qualified YES. In
general, SDRAM is backward compatible and can run at bus speeds slower than
that for which it is rated. For example, the 128 Mbytes of PC133 memory I
have in my computer with an EpoX MVP3G2 Super 7 motherboard, which supports
PC100 memory, works with a 100 Mhz FSB.. There are a few older 66 Mhz motherboards
that will not work PC100 or PC133 memory, but they are exceptions, not the