ram terms??

[alondra]

what do the following mean
EDO.parity,non parity, CAS
never seen these notations on it. when I bought it.

[spark25]

Here you go senior member,some info on ram here. (http://arstechnica.com/paedia/r/ram_guide/ram_guide.part1-1.html)

[Nomadd]

Hi Alondra, here it goes;

EDO = Extended Data Output Ram: It is a variation of DRAM. It is the most common DRAM. It's a little faster than old Fast Page Memory Ram (FPM) It is usually found in older Pentium systems. EDO can be used in non-EDO motherboards, but there will be NO performance boost noticable http://sysopt.earthweb.com/forum/frown.gif

Parity = is a way of checking the integrity of what has been written to RAM. Kind of a self-check system that uses an extra "bit" to accomplish this task. It is more expensive than Non-parity memory, which , of course, DO NOT perform this check (more bang for the buck I guess http://sysopt.earthweb.com/forum/smile.gif

As for CAS, well, I must admitt defeat here http://sysopt.earthweb.com/forum/frown.gif I DONT KNOW WHAT THE HELL THAT MEANS! hehe. Perhaps one of the gurus that hangs out at sysopt can explain to us both what it means.

But, I hope I helped you a little http://sysopt.earthweb.com/forum/wink.gif

[alondra]

Senior member? darn, now people will think I know something, I just have more questions than answers http://sysopt.earthweb.com/forum/smile.gif http://sysopt.earthweb.com/forum/smile.gif Thanks for the info. and the link.
alondra

[tonym]

Hi al,

CAS = Column-Address Strobe. It is the column address selector for the DRAM.
RAS = Row-Address Strobe.
CBR = CAS-B4-RAS. Usually implemented by the Northbridge chipset or membory controller as a technique where the RAS signal is present before the CAS signal to make sure that the refresh rate of the DRAM is as fast as possible. Sort of a reverse scratchpad to identify which memory needs refresh!

Hope this helps...

Tony

[This message has been edited by tonym (edited 09-07-2000).]

[Nomadd]

Thanks Tonym http://sysopt.earthweb.com/forum/smile.gif

[Roy]

tonym's definition of CAS is correct.

However, the important specification for SDRAM is CAS Latency, often and incorrectly called just "CAS".

Once again, CAS LATENCY is the number of clock cycles from when a request for data arrives until a valid data output is available. It is one indicator of how fast RAM will run. Memory that has a CL=2 at it's rated speed usually will run as much as 30% faster. At higher speeds, the system must be set for CL=3.

[Don't worry, I'll say it again the next time someone asks. http://sysopt.earthweb.com/forum/wink.gif]

[alondra]

Hi when I asked the clerk about this he didn't have a clue. and the RAM pkg. said nothing sbout it, from what I gather this is a technical factor, that for ordinary use is not important and I wouldn't see any difference.