Abit and Memory CL2

Carsten Keunecke · Jul 26, 2003

Hi,

is it necessary to buy CL2 PC400 Memory or is CL2.5 or even CL3 enough? Is there a big speed-difference?! I?m not sure that?s why I?m asking!!! The price for CL2 is twice as much as for CL3....

Cheers,
Carsten

TomG · Jul 26, 2003

the lower that number and other associated memory timings, the faster the ram responds to storage and retrieval. people generally go for the fastest ram they can get so that it is not a limiting factor on the current, and maybe future, systems. of course, the budget for building the system has to be kept in mind as well...

Dave Hau · Jul 26, 2003

Does the CAS setting affect access time, throughput, or both?

Thanks,

Dave

"TomG" wrote:

the lower that number and other associated memory timings, the faster the ram responds to storage and retrieval. people generally go for the fastest ram they can get so that it is not a limiting factor on the current, and maybe future, systems. of course, the budget for building the system has to be kept in mind as well...

--

Thomas Geery
Network+ certified

ftp://geerynet.d2g.com
ftp://68.98.180.8 Abit Mirror <----- Cable modem IP
This IP is dynamic so it *could* change!...
over 115,000 FTP users served!
^^^^^^^
... Is there a big speed-difference?! I?m not sure that?s why I?m asking!!! The
price for CL2 is twice as much as for CL3....

Cheers,
Carsten

TomG · Jul 26, 2003

I could be wrong but CAS stands for Column Access Strobe if I recall. You can probably find out a good deal about these timings on the web at Crucial.com. These timings are a measure of how many clock cycles will have to pass during the particular operation with the memory. The lower the numbers, the faster the operation so it only follows that accessing the memory will be faster.

however, ram throughput, in my opinion, would be affected much greater by the bus speed that the ram is running on. PC100 and PC133 versus DDR266, DDR333 and DDR400 for example. DDR 400 is running on a 200 Mhz memory bus and will be a lot faster than PC100 or PC133. in this case, I am comparing regular SDRAM with DDR ram, I realize.

Lee (3) · Jul 26, 2003

There is very minimal difference between cas 2 and cas 2.5 around 5% performance difference i believe cas 3 is the slowest. You could probably get the 2.5 memory to run stable with CL2.

On Sat, 26 Jul 2003 19:20:45 +0200, "Carsten Keunecke"
had the will to write:

Hi,

is it necessary to buy CL2 PC400 Memory or is CL2.5 or even CL3 enough? Is there a big speed-difference?! I?m not sure that?s why I?m asking!!! The price for CL2 is twice as much as for CL3....

Cheers,
Carsten

----
Lee

Dave Hau · Jul 26, 2003

Thanks for the explanation. I know roughly that CAS affects memory speed but I've always wondered whether it was access time and/or throughput. Your explanation cleared things up.

Cheers,
Dave

"TomG" wrote:

I could be wrong but CAS stands for Column Access Strobe if I recall. You can probably find out a good deal about these timings on the web at Crucial.com. These timings are a measure of how many clock cycles will have to pass during the particular operation with the memory. The lower the numbers, the faster the operation so it only follows that accessing the memory will be faster.

however, ram throughput, in my opinion, would be affected much greater by the bus speed that the ram is running on. PC100 and PC133 versus DDR266, DDR333 and DDR400 for example. DDR 400 is running on a 200 Mhz memory bus and will be a lot faster than PC100 or PC133. in this case, I am comparing regular SDRAM with DDR ram, I realize.

--

Thomas Geery
Network+ certified

ftp://geerynet.d2g.com
ftp://68.98.180.8 Abit Mirror <----- Cable modem IP
This IP is dynamic so it *could* change!...
over 115,000 FTP users served!
^^^^^^^
... and maybe future, systems. of course, the budget for building the system has
to
be kept in mind as well...

--

Thomas Geery
Network+ certified

ftp://geerynet.d2g.com
ftp://68.98.180.8 Abit Mirror <----- Cable modem IP ...

borolad · Jul 27, 2003

In article <bfud99$sc5$>,
says...

Hi,

is it necessary to buy CL2 PC400 Memory or is CL2.5 or even CL3 enough? Is there a big speed-difference?! I?m not sure that?s why I?m asking!!! The price for CL2 is twice as much as for CL3....

Cheers,
Carsten

A comprehensive overview can be had here:

http://www.corsairmicro.com/memory_basics/153707/index.html

Hope this helps, BoroLad

TomG · Jul 27, 2003

cool...

KJ · Jul 27, 2003

that was a nice presentation. thanks for providing the link.

"BoroLad" wrote:

In article <bfud99$sc5$>,
says...
Hi,

is it necessary to buy CL2 PC400 Memory or is CL2.5 or even CL3 enough? Is there a big speed-difference?! I?m not sure that?s why I?m asking!!! The price for CL2 is twice as much as for CL3....

Cheers,
Carsten

A comprehensive overview can be had here:

http://www.corsairmicro.com/memory_basics/153707/index.html

Hope this helps, BoroLad

borolad · Jul 28, 2003

In article <cwPUa.25492$zd4.5444@lakeread02>,
says...

cool...

UR welcome TomG & KJ, now if only I could find a similarly impirical one on sheep, so we could all share "Homieï¿½'s" understanding of these wool bound creatures finer points!

BoroLad

Jerry Polyak · Jul 28, 2003

Homie is not interested in points, just nooks and crannies.

"BoroLad" wrote:

In article <cwPUa.25492$zd4.5444@lakeread02>, says... cool...

UR welcome TomG & KJ, now if only I could find a similarly impirical one on sheep, so we could all share "Homieï¿½'s" understanding of these wool bound creatures finer points!

BoroLad

borolad · Jul 28, 2003

In article <TNXUa.171287$>,
says...

that was a nice presentation. thanks for providing the link.

Your welcome mate, glad to help!

"BoroLad" wrote:

In article <bfud99$sc5$>,
says...
Hi,

is it necessary to buy CL2 PC400 Memory or is CL2.5 or even CL3 enough? Is there a big speed-difference?! I?m not sure that?s why I?m asking!!! The price for CL2 is twice as much as for CL3....

Cheers,
...