Memory specification

[mark winslow]

What does CL2.5 designate in regards to RAM?

ie: PC2700 CL2.5 Non-Parity DDR SDRAM SODIMM Memory

what is the difference between this and PC2700 Non-Parity DDR SDRAM SODIMM Memory?

 

[StrangleHold]

Another common marketing term attached to SDRAM modules is either "CAS2" or "CAS3". Unfortunately, this is a misnomer; these should be called CL2 or CL3, since they refer to CAS Latency timings (2 clocks vs. 3 clocks). The CAS Latency of a chip is determined by the column access time (tCAC). This is the time it takes to transfer the data to the output buffers from the time the /CAS line is activated.

 

[Geoff]

Another common marketing term attached to SDRAM modules is either "CAS2" or "CAS3". Unfortunately, this is a misnomer; these should be called CL2 or CL3, since they refer to CAS Latency timings (2 clocks vs. 3 clocks). The CAS Latency of a chip is determined by the column access time (tCAC). This is the time it takes to transfer the data to the output buffers from the time the /CAS line is activated.

It does say CL, not CAS...

Since you already explained it, im not going to explain it again, but the lower the better

 

[mark winslow]

so there mis no difference between a RAM that is speced at PC2700 Non-Parity DDR SDRAM SODIMM Memory and PC2700 CL2.5 Non-Parity DDR SDRAM SODIMM Memory ?

 

[Geoff]

Theres really not, although the first one may have a higher Cas Latency.

 

[fade2green514]

well, memory is required to take a break basically so its 2nanoseconds versus 3 nanoseconds. it doesnt effect overall bandwidth nominally...
they also added 2.5 into some memory modules to add stability but keep some performance. most pre-builts have timings that look something like 3-3-3-8 for ddr and 5-5-5-15 for ddr2... which is very high. like i said, it doesnt matter a whole lot... they just do this for pre-builts because it adds stability and greatly decreases chance of a system crash ever happening in the future.