[Arm-netbook] alternative SO-DIMMS

Luke Kenneth Casson Leighton luke.leighton at googlemail.com
Tue Mar 9 15:13:28 GMT 2010

On Tue, Mar 9, 2010 at 2:12 PM, Michelle Konzack
<linux4michelle at tamay-dogan.net> wrote:
> Hello,
> Am 2010-03-09 13:30:14, schrieb Luke Kenneth Casson Leighton:
>>  chitech's (actually Seatron's) 30mm x 70mm SO-DIMM has 2 memory chips
>> on one side (total of 256mb), and there are 2 unpopulated on the
>> *other* side of the SO-DIMM (which you can't see from the photo of the
>> CT-PC89E).
> OK
>>  so it caaan be done, but i realise that it makes the design slightly complex.
> I was thinking they avoid using the backside du to the height.

 there's something like 2mm clearance, maybe 3. (not exactly sure how
much). they've placed an incredibly thin plastic film over the
motherboard PCB.  the LDOs and other discrete components are on the
underside: some of them are really quite high.

 next time i disassemble the CT-PC89E i'll take a photo.

> It is  on  <http://www.karo-electronics.de/tk71.html>  and  there  is  a
> smaller module from another manufacturer.
>> ... $EUR 99 had better not be the mass-volume price of the SO-DIMM,
>> though, even if they can do 1200mhz.  the 833mhz Samsung ARM Cortex A8
>> S5PC100 is $14.50 (and 256mb of DDR2 RAM works out at around $10)
>> which brings an entire S5PC100-based SO-DIMM in at somewhere around
>> $32 to $35.
> I like to know the price @50.000 for the Kirkwood   :-D

 yeah - likewise.

>> but, yeah: if they already _have_ an SO-DIMM with the kirkwood 88F6281
>> then that's better than actually having to do a complete design from
>> scratch.
> I think, once I have designed a smaler SO-Dimm  as  the  TK91,  in  mass
> production it is nearly the same price as the Samsung
> So, because I develop some Computers based on the Marvel  Chips,  it  is
> less expensive for me to use only Marvel.  However, the  800Mhz  version
> of the Kirkwood should be less expensive as the 1200MHz version.
> So, if the SO-Dimm 1200MHz EVKit version cost 99 Euro, the striped  down
> SO-Dimm with 800MHz and 512 MByte of memory woul be the same price.
> The advantage for me is I have only to develop one SO-Dimm and  can  use
> different versions (speed).
> Developing stuff with Samsung cost me extra money
>>  ... time to market etc. etc.
> Wednesday and Thursday I will kow more about TI and Marvel.  If  Marvel
> offer me a genial price for mass-production, I will start  as  fast  as
> possibel.

 fantastic.  i'll talk to adam, advise him to get the info from
chitech, and to mention that there's the possibility to provide them
with an upgrade to 1.2ghz.


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