[lm-sensors] My 333 DIMMs are only being recognised as 266 by the

[lm-sensors] My 333 DIMMs are only being recognised as 266 by the

[Per Jessen]

Hi,
I have a couple of new AOpen boards, each with a single Kingston PC2700 333MHz 256Mb DIMM stick. 
At start-up, both boards report the memory operating at 266MHz, in spite of the DIMMs being
specified as 333MHz. 
I was hoping decode-dimms would help me determine what the SPD says about this, but "Intel
Frequency Specification" comes out as "Undefined!" ...

This is the decode-dimms output (in HTML format):  http://jessen.ch/files/spd-decoded

Can someone help me point the finger at either Kingston or AOpen? 


-- 
/Per Jessen, Z?rich
http://www.spamchek.ch/freetrial - ?berzeugen Sie sich - 30 Tage kostenlos und unverbindlich!

[lm-sensors] My 333 DIMMs are only being recognised as 266 by

[Rudolf Marek]

Hi Per,

You can try decode yourself.
As root you can do:
modprobe i2c-dev
i2cdump 0 0x50
(0 is bus number, 0x50 is first dimm slot, adjust as needed, you can use sensors command to tell you bus and chip number)
This will obtain memory dump to which you can apply DDR SPD specification
http://www.jedec.org/download/search/4_01_02_10R13.pdf
(or simply you can find it via google SPD DDR site:jedec.org)

Then you can try to decode the fields yourself. Just beware some parts of SPD specs have decimal instead of hex numbers.
I hope it helps

Regards

Rudolf

[lm-sensors] My 333 DIMMs are only being recognised as 266 by the

[Per Jessen]

On Tue, 14 Jun 2005 17:07:37 +0200, Rudolf Marek wrote:

>Hi Per,
>
>You can try decode yourself.
>As root you can do:
>modprobe i2c-dev
>i2cdump 0 0x50
>(0 is bus number, 0x50 is first dimm slot, adjust as needed, you can use sensors command to tell you 
bus and chip number)
>This will obtain memory dump to which you can apply DDR SPD specification
>http://www.jedec.org/download/search/4_01_02_10R13.pdf
>(or simply you can find it via google SPD DDR site:jedec.org)

Hi Rudolf,

thanks for the reply, but isn't this more or less what decode-dimms.pl does too?  That
is my understanding.  I know this is probably a little OT on this list, but I was hoping
someone could take a look at the listing from decode-dimms (http://jessen.ch/files/spd-decoded)
and explain to me (very slowly) what makes this DIMM 266MHz and not 333MHz ? 


/Per Jessen, Zurich

-- 
http://www.spamchek.com/freetrial - sign up for your 30-day free trial!

[lm-sensors] My 333 DIMMs are only being recognised as 266 by

[Rudolf Marek]

> Hi Rudolf,
> 
> thanks for the reply, but isn't this more or less what decode-dimms.pl does too?  That
> is my understanding.  I know this is probably a little OT on this list, but I was hoping
> someone could take a look at the listing from decode-dimms (http://jessen.ch/files/spd-decoded)
> and explain to me (very slowly) what makes this DIMM 266MHz and not 333MHz ? 

Hi again,

I have time now after exams and yes now I know where to look. :)

Cycle Time (SDRAM) highest CAS latency	6ns
6ns -> 166MHz * 2 = DDR333 * 8B -> PC2666 (2700)

So the DIMM is capable of running at "333MHz".

Did you tried to upgrade the BIOS?

regards

Rudolf

[lm-sensors] My 333 DIMMs are only being recognised as 266 by

[Per Jessen]

On Sat, 02 Jul 2005 17:47:20 +0200, Rudolf Marek wrote:

>I have time now after exams and yes now I know where to look. :)

Hehe :-)
Thanks for getting back to me.

>Cycle Time (SDRAM) highest CAS latency	6ns
>6ns -> 166MHz * 2 = DDR333 * 8B -> PC2666 (2700)
>So the DIMM is capable of running at "333MHz".

Ah, very good.  I thought it should be ok.  

>Did you tried to upgrade the BIOS?

Yeah, I have already the latest version.  I have opened a support
case with AOpen. 


/Per