Corollary: Are all memory chips therefore dual channel compatible?

Another question: How can one tell whether RAM is being accessed at a dual
channel speed?

Thanks!

On Mon, 25 Jul 2005 17:07:29 -0400, "msim"
<mxsimx20x20@yaxhoxo.cox> wrote:

Dual channel is always a motherboard feature, there is no
difference in the memory (chips, PCB, or timings for dual
channel). Many times manufacturers (or resellers) will
simply market it as such "dual channel" memory.


Your BIOS may list it in the information screen when it
POSTs. Some utilities might tell you, though I don't know
which ones- you could Google for some.

Also benchmarks should reveal it, bench the memory with a
single module and compare to having two modules installed.
If two modules are faster that is evidence of dual channel
mode, as ANY properly working bios should at very most, have
same memory parameters with more memory modules installed
but often slower as a result (unless you were manually
changing the memory related settings). Thus, two memory
modules not in dual channel mode would not be faster than
either of the modules alone, presuming that you at least
have enough memory that the system isn't using the pagefile
for virtual memory during the testing.

Dual channel memory is a motherboard feature. HOWEVER, in order to utilize
it you must use IDENTICAL matched pairs of RAM. Using non-identical RAM
sticks will allow only single channel RAM useage.

--
DaveW



"msim" <mxsimx20x20@yaxhoxo.cox> wrote in message
news:ioudneXqsckLyXjfRVn-vg@comcast.com...

"msim" <mxsimx20x20@yaxhoxo.cox> wrote in message
news:ioudneXqsckLyXjfRVn-vg@comcast.com...
POST messages as the PC boots.

SteveH

Thank you all! That works.

It is of course interesting how they market memory modules as dual channel!
Perhaps the marketers are refering to the modules being perfectly matched
and so on.


"SteveH" <steve.hough@NOSPAMblueyonder.co.uk> wrote in message
news:qjzFe.77788$G8.47179@text.news.blueyonder.co. uk...

On Mon, 25 Jul 2005 17:07:29 -0400, msim wrote:

There are no dual channel DDR memory chips. Dual channel memory systems
use pairs of DIMMs.