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Re: getting the speed of the RAM

Mark Ryden wrote:
> Hello,
> I have a couple of machines on which there are various
> fedora distros (F10, F9 and  F8) and redhat enterprise distros.
> On some of them lm_sensors run, on some lm_sensors does not run.
> I try to get the speed of the RAM using dmidecode and lshw but I can't. I do
> get other helpful about the RAM (like size, type, etc). but the speed
> entry shows: "Current Speed: Unknown". I had heard from other people that
> on their machines dmidecode **does** show the RAM Speed. I must add that
> these machines are x86_64 based, and some of them are really brand new.
> I know of course that I can get this info from BIOS (or open the case and
> look at the RAM sticks themselves) .
> Is there any utility or some entry under /sys or /proc where this info
> is available ?
> Rgs,
> Maek
I would suspect that either your BIOS does not support supplying the
speed information, or the memory module itself does not report it.
It would be nice if all the modules would properly report
information, but it seems like it depends on who manufactured the
module, and what information they chose to include. Sometimes I
thing it is because they do not rate the memory speed until the
module is built, and they run tests on samples from the batch to see
what speed they can properly handle, and don't go back and program
that info into the module.

Also, some modules are "backward compatible" and support slower
speeds as well as their rated speed. (pc3200, pc2700, pc2100 for
example.) SO the module can not report the speed, and if the BIOS
does not report the speed the module is running at, you are out of luck.


  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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