I have 128 mb ram in each slot in rev A, working fine. If I recall correctly
they have been found to recognize 256 in the top slot, but just 128 in lower
slot for an absolute max of 384 ( the rev b may be able to take more, but
I'm thinking that wasn't until rev C). I believe Apple originally stated
they would recognize a max of 128 in each slot. Macspeedzone says the rev
a-e imacs will all take 512 mb total, however- 256 each slot- (see
http://macspeedzone.com/html/hubs/specs/imac/imac.shtml), but I dont think
this is correct for the a's- I think 384 is the max.
I dont think firmware has anything to do with it.
Is anyone out there running a 256 in their top slot?
I believe it should work; it 's very strange that your computer
recognizes PART of the ram. Did you mean to say you were getting 192 mb
total (128+64= 192) rather than 196? It sounds like you really installed a
128 chip and not a 256. I would try to verify that it's a 256 or exchange
it. You can try to identify your RAM modules by looking here:
<http://www.chipmunk.nl/DRAM/ChipManufacturers.htm>
NickUtah
> Message-ID: <[EMAIL PROTECTED]>
> Date: Fri, 12 Jul 2002 21:53:15 -0700 (PDT)
> From: Greg Miller <[EMAIL PROTECTED]>
> Subject: Rev A iMac Memory Upgrade
>
> Hi all,
>
> I've got a very frustrating issue with my original
> Revision A iMac. I have read at numerous sites that it
> is possible to upgrade to anywhere from 386-512 megs
> of RAM.
>
> I'm running 9.1, and recently changed my memory
> configuration; I put the 64 meg DIMM I had in the top,
> into the bottom, and installed a 256 meg DIMM in the
> top. However, after restart, the machine only
> recognized 128 out of the 256 meg DIMM; this left me
> with 196, rather than 320!
>
> I have a feeling I need to do a firmware update, or
> something. However, the only one I was able to find on
> Apple's website, was 1.2. When I tried to install it,
> it informed me that it was unable to install because
> it could not recognize the Firmware that was currently
> installed ("it may be a newer version..").
>
> I'm extremely puzzled right now. Am I going to have to
> return my 256 meg DIMM and settle for 192 (the
> official max listed on Apple's spec sheets), or can
> somebody here explain to me what I'm doing wrong? :-)
>
> Thanks,
> Greg Miller
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