I'm upgrading an eMac to 1 GB RAM (2 x 512 MB). A dude is selling the following chips, but I don't know what CL3, CL2.5, SDRAM, SDCL3, 168P and DIMM means. Could someone please explain what these terms mean, and most importantly: Which ones will work on the Mac?
1 x Kingston 512MB 133MHz CL3
1 x RAMOS TEK 512MB 133MHz CL2.5
1 x Samsung 512MB PC133 SDRAM
1 x TwinMOS 512MB PC133 CL3
1 x Winbond 512MB PC133 SDCL3
3 x Transcend 512MB PC133 SDRAM 168P DIMM
Best Answer
You never mentioned which eMac you specifically had, but according to EveryMac.com, there are only two possibilities:
Both machines require 184pin modules
CL
numbers have to do with the latency of the memory (CAS Latency) or in other words, how many clock cycles before it transfers data. Lower numbers are faster.SDCL3
just looks like a manufacturer "smashing" together of SDRAM and CL3.DIMM
is "dual in-line memory module." Basically, there's memory paths on both sides of the module (as opposed to SIMMs).For more info, see this article on RAM types.
As for which memory will work in your eMac, it's impossible to say for sure because they're all (with the exception of the Transcend memory at 168 pins) missing the pin count. If they are 184 pins, then they should work.