RIMMs operate at speeds of 600 MHZ (PC600) or 800 MHz (PC800). All installed RIMMs must operate at the same speed, and have the same ECC or non-ECC rating. The operating speed is different than the data path size. RIMMs are avilable in 16- or 32-bit data path.
600 MHz or 800 MHz
rimms
You replace C- Rimms with Rimms.
because they're bad
RIMMs are traditionally faster and more expensive
You replace C- Rimms with Rimms
For RIMM modules, install the RIMMs beginning with bank 0 then 1 and so on.
16 bit without ECC and 18 bit with ECC Source : A+ Guide to hardware 4e
I believe it's 0
DIMMs are the newer tech.
SO-RIMMs