[Arm-netbook] My little idea...

[Christopher Havel]

They make 5mm thick 40mm fans. I have a couple. Not hard to adapt that 
to a blower -- the jerry-rig way is to cover what'd normally be the 
exhaust with a bit of thin plastic and then clip off one of the four 
sides of the fan housing, presto, you got one blower that works fine, 
altho you'll also have a 40mm square area on the PCB that you can't use 
on one side -- or use one of these and have a proper hole in the PCB --> 
http://www.ebay.com/itm/321090918766

Either way, as long as you've got good venting it'll work.

Also... if you're talking about the Celeron M ULV 600 I have a board 
with one of those and it's useless. I can't get even a fairly light 
version of Puppy to work on it without really rattling my patience 
fast... DSL might fare slightly better but I can't stand the look. Talk 
about "Made For Windows 98"... >.< ugh.

PicoITX is a little larger than what you're working with -- 72*100mm -- 
but it still works and it works well. I think it's doable with a nice 
copper heatsink and a blower that doesn't ever cut off... although 
you've got a point re: the VRMs... they like to heat up.

What if you used the PCMCIA shell as the VRM heatsink...? Make it 
aluminum and require some vent holes near it on the carrier board 
housing... not as cheap or strong as steel but it'll probably do, 
especially if the VRM is efficient and switching and not nasty old 
linear crap like a 78xx is...

On 10/16/2013 7:50 PM, luke.leighton wrote:
> On Wed, Oct 16, 2013 at 10:16 PM, Christopher Havel
> <laserhawk64 at gmail.com> wrote:
>> My understanding, which was based on the Wiki, was that gigabit and USB3
>> would be implemented later.
>   not quite correct.  *in the future* there will be other CPU Cards
> with those features.  the spec *allows* for those.  so if you design
> an I/O board which only has 10/100, it's not going to be desirable or
> useful with a CPU Card that has gigabit capabilities, is it?
>
>   and the one thing that EOMA68 is designed for is with "long term
> investment" in mind.  you buy one or more chassis' and you keep them
> in service until they literally fall apart of old age.   .. and you
> upgrade the CPU Cards to make sure they stay useful and current.
>
>   ... so if you design a chassis with only USB2 or 10/100 ethernet, how
> is it going to be useful to anyone in 2-3 years time?
>
>> Just a thought on the x86 bit... I actually have a PicoITX board (super
>> doober cheap eBay find!) that uses the Atom Z530 + NM10 chipset. It's
>> Poulsbo PITA graphics but some Linuces do work, including a couple versions
>> of Puppy. Oh right -- the PSU is a 5v 4a model...
>   yeah, exactly.  the closest that intel gets to "low power" is an ULV
> 600mhz processor that uses 2.5 watts.  that's excluding the
> southbridge chip!
>
>> Just a few thoughts on that sort of config...
>>
>> Atom Z530 = 2.0w TDP
>> NM10 PCH = 2.1w TDP
>>
>> ...so a Z530 + NM10 = 4.1w TDP.
>   yeah exactly.  now try putting that on a 43 x 75mm board in an
> enclosed space - don't forget that DDR3 RAM will add another 0.75
> watts (assume 2x 32-bit @ 800mhz).  and then there's the inefficiency
> of the PMIC.  now you're well over 7 watts.
>
>> According to CPU-World, the max power dissipation ever for a Z530 would be
>> 4.64w. According to the NM10 datasheet (DC Characteristics on p225) and a
>> bit of math, the maximum power dissipation in the S0 state would be 2.794w.
>> That's a total of 7.434w, leaving a ton of room (electrically speaking) for
>> a fan.
>   you can't get a fan in a 5mm space.  and it has to go on the CPU Card
> (the fan) because otherwise it's necessary to add a fan into the
> *other* side of the spec... and that's a cost that's completely
> unnecessary *and* means that when you get into mass-volume you just
> stuffed a) the profit margins b) the reliability.
>
>> So maybe look at that config...? or is Intel incompatible with you guys for
>> licensing reasons or something?
>   not at all.  intel just simply don't have a product that works.
> they've been told.  i've tried reaching out to AMD: it's like climbing
> a glass wall.  i even contacted RDC and they honestly don't believe in
> their own product because nobody's trying to buy it.  and the RDC
> IAD100 series also needs a companion IC and a 3D GPU to make it
> comparable.
>
>   l.
>
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