because they're bad
You replace C- Rimms with Rimms.
You replace C- Rimms with Rimms
184-pin RIMMs
rimms
False, Sytems using Rimms are no longer in production
RIMMs are traditionally faster and more expensive
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.
For RIMM modules, install the RIMMs beginning with bank 0 then 1 and so on.
All RIMM slots must be filled either with RIMM modules or CRIMM modules."23. Fill 'er up. Leaving a memory slot empty is not a problem as long as you install DIMMs. If you install RIMMs in your system, however, then you need to make sure every slot is full. No, you don't have to buy more of the pricey Rambus memory modules; simply use a pair of CRIMMs (continuity RIMMs), as they're called, to plug the empty memory slots on the motherboard. You can buy CRIMMs for $10 to $15 each from computer retailers. Failing to fill empty Rambus memory slots with CRIMMs will result in a computer that doesn't boot."Taken from http://www.smartcomputing.com/editorial/article.asp?article=articles/archive/l0909/27l09/27l09.asp&guid=
I believe it's 0
DIMMs are the newer tech.
SO-RIMMs