[dmidecode] dmidecode and RAM speed limit

[Mark Ryden]

Hello,
  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.

Regards,
Mark