Actually, depending on the application, sometimes CAS2 memory may be
faster than 3 memory. Check the August 18th item from here
<http://www.barefeats.com/quick.html>:
August 18th, 2005 -- Maybe memory latency speed makes a difference
after all. I was doing some testing on two different G5/2.5GHz Power
Macs. They are configured identical in every way (8GB RAM, GeForce
6800 Ultra). In fact, they have identical Raptor 10K boot drives in
the top factory slot with contents of one cloned to the other. When I
ran my Motion 2 "render RAM preview" test, one system ran 8% faster
than the other. Why? Well, there is one difference. The faster G5 had
CAS 2 memory and the other one had CAS 3. (The CAS 2 memory we used
was Patriot PDC2G3200LLK dual channel memory. Frys Electronics
carries it, as does Monarch, NewEgg, and ZipZoomFly.)
Understand that this particular test is a very intensive RAM based
test, so it is very sensitive to memory speed. The flip side is
that for 99% of us the limit to using a computer is how fast the
person using the computer works.
yeah yeah i post to the list without first searching the internet. anyway,
here is the answer to my own question:
29. What is the performance difference between CL2 and CL3?
CL2 parts process data a little faster than CL3 parts, in that you have to
wait one less clock cycle for the initial data. However, after the first piece
of data is processed, the rest of the data is processed at equal speeds.
Latency only affects the initial burst of data. Once data starts
flowing, there is
no effect. A clock cycle for a PC100 module is 10 nanoseconds so you probably
won't notice a significant performance difference. Most systems will accept
either latency part. However, there are some systems that require
either CL2 or
CL3 parts.
So in a PC133 system you have to wait an additional 6.7 nanoseconds before
the information starts flowing.
chris p
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