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From: George Macdonald on 11 Oct 2006 16:03
On 10 Oct 2006 22:05:33 -0700, "Ethics Forge" <lokkju(a)gmail.com> wrote:

>No, I said, and I meant, MicroDIMM - it is smaller then SO-DIMM, and
>generally used in subnotebooks

Sorry but I've never messed with sub-notebooks. See my 2nd sentence then:
the packaging and chips to allow this form factor at that size was at the
end of the SDRAM era.

--
Rgds, George Macdonald
From: George Macdonald on 11 Oct 2006 16:03
On Wed, 11 Oct 2006 12:57:06 GMT, a?n?g?e?l(a)lovergirl.lrigrevol.moc.com
(The little lost angel) wrote:

>On 10 Oct 2006 16:49:19 -0700, "Ethics Forge" <lokkju(a)gmail.com>
>wrote:
>
>>Can someone tell me (or link me to someplace that will explain it) why
>>144pin MicroDIMM (non-ddr) PC100/PC133 modules only seem to go up to
>>256MB? I for the life of me can't find what, if any, technical
>>limitation there is, and am curious if it is a technical or market
>>limitation that makes them only be available up to 256MB.
>
>I think most manufacturers just don't see much of a market for laptops
>that old. So microDIMMs just don't get any bigger than whatever is the
>largest at the point the technology got overtaken by DDR and now DDR2.
>They just don't bother to make memory chips of higher density for the
>older standard.

True about the changeover to DDR but PC-133 SDRAM 512Mb chips are available
now - apart from just the economics, I think it's more to do with the
packaging: FBGA was just being adopted for commodity DRAMs at about the
same time as DDR took over. I also recall the 512MB PC-133 SO-DIMMs I
purchased had the chips in a very strange package... looked like a blob of
asphalt glued to the DIMM substrate, 4 per side and probably would not have
fit on a MicroDimm.

--
Rgds, George Macdonald
From: The little lost angel on 13 Oct 2006 14:24
On Wed, 11 Oct 2006 16:03:49 -0400, George Macdonald
<fammacd=!SPAM^nothanks(a)tellurian.com> wrote:

>True about the changeover to DDR but PC-133 SDRAM 512Mb chips are available
>now - apart from just the economics, I think it's more to do with the
>packaging: FBGA was just being adopted for commodity DRAMs at about the
>same time as DDR took over. I also recall the 512MB PC-133 SO-DIMMs I
>purchased had the chips in a very strange package... looked like a blob of
>asphalt glued to the DIMM substrate, 4 per side and probably would not have
>fit on a MicroDimm.

But that's largely economics no? I'm sure they would had found a way
to fit it if they really wanted to. After all, there are DDR 512MB
microDIMMs, just not for PC100/PC133.

However, of course daytripper's comment about the chipset limitations
is probably the main thing :PpP

--
A Lost Angel, fallen from heaven
Lost in dreams, Lost in aspirations,
Lost to the world, Lost to myself
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