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Re: [dmidecode] dmidecode and RAM speed limit

From: Mark Ryden
Subject: Re: [dmidecode] dmidecode and RAM speed limit
Date: Mon, 2 Mar 2009 15:09:34 +0200

Hi, Jean ,

I hoped I could somehow skip looking in the manual or inserting a
stick inside to perform this check. But it is probably not possible.


On Mon, Mar 2, 2009 at 2:57 PM, Jean Delvare <address@hidden> wrote:
> Hi Mark,
> On Mon, 2 Mar 2009 13:56:48 +0200, Mark Ryden wrote:
>>   I have DDR2 Ram of 667 MHz. I want to upgrade it to a higher speed DDR2.
>> If I remember correctly, when I bought the machine it was written on some 
>> note
>> that the max speed for DDR2 ram on this machine is 800 MHz , but I am not 
>> sure
>> and I cannot find the note.
>> I see that there is DDR2 with 667  MHz, 800  MHz and 1066 MHz in stores.
>> Is there a way to know what is the highest RAM speed for my motherboard?
>> I tried to find this info from dmidecode and from
>> decode-dimms of i2c-tools  and could not.
> decode-dimms reads timing information from the memory modules but it
> has no clue about the memory controller capabilities.
> In theory dmidecode could help, however in practice the memory module
> speeds supported by the controller are almost always improperly
> reported. So I wouldn't trust dmidecode for this task.
> What are your motherboard's manufacturer and model name? Your best
> chance IMHO is to look for technical documentation on the
> manufacturer's website. Most motherboard manuals include information
> about the supported memory module speeds.
> Alternatively, if you have a spare higher speed module at hand or can
> borrow one for a short period of time, you could just try to stick that
> one module alone in the machine and see at which speed the BIOS says it
> will run it. This should tell you right away if your system supports
> that speed or not.
> --
> Jean Delvare

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