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versaceboi
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Location: PA
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 Posted: Wed Jun 01, 2005 3:33 pm Post subject: 2GB Ram Upgrade? Possible? |
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Anyone have any ideas on this? Any testimonials?
I know the mini only is supported up to 1GB however, I've been hearing rumors that it might be able to handle up to 2GB....
your thoughts???
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billabong
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| Posted: Wed Jun 01, 2005 4:05 pm Post subject: |
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Apple said they were going to certify 2GB PC 2700 RAM when the mini first came out. Maybe they're waiting for the new models to come out before they announce it. Read the second paragraph down.
"Apple representatives on the Expo show floor confirmed plans to certify 2GB PC2700 RAM for the system, as well."
http://www.macworld.com/news/2005/01/11/macmini/index.php |
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devo
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| Posted: Thu Jun 02, 2005 9:16 am Post subject: |
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Would it damage the mini if you wanted to try one out?  |
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greg
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LouieMacGoo
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| Posted: Thu Jun 02, 2005 11:56 am Post subject: |
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Well that just about answers that question!!! I was really hoping that it would! 
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outlaw20
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| Posted: Thu Jun 02, 2005 9:22 pm Post subject: |
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With a patch/driver or some form of BIOS/software from apple or a smart third party, would it be possible, or is it hardware wise?
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trag
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Joined: 16 Jul 2010
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| Posted: Wed May 11, 2011 4:34 pm Post subject: |
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| billabong wrote: | Apple said they were going to certify 2GB PC 2700 RAM when the mini first came out. Maybe they're waiting for the new models to come out before they announce it. Read the second paragraph down.
"Apple representatives on the Expo show floor confirmed plans to certify 2GB PC2700 RAM for the system, as well."
http://www.macworld.com/news/2005/01/11/macmini/index.php |
According to the Apple Hardware Developer Note, the G4 Mini has thirteen address lines, A0 - A12, and two Bank lines, BA0 - BA1, connected to the DIMM socket. DIMMs may have a maximum of sixteen chips. The DIMM is 64 bits (8 bytes) wide.
The address is multiplexed (used twice) so that's really 2 X 13 = 26 address bits available for 64M addresses. The two bank lines give another four possibilities so that 64M X 4 = 256M addresses can be accessed. So 256M X 8 bytes wide = 2 GB.
In practice, one would need to find a DIMM made out of sixteen 64M X 4bit X 4bank memory chips. The Micron MT46V256M4-6T or -5B would do the trick.
I've seen 2GB DDR DIMMs, but they've all been registered and/or ECC. I have yet to see a 2GB DDR DIMM which is unregistered and non-ECC.
Of course, one could also build such a DIMM out of eight 64M X 8bit X 4 bank parts, but that would be a 2Gb memory chip, and as far as I can tell no one makes/made a 2Gb DDR memory chip. They only went up to 1Gb.
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jb
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Joined: 19 Aug 2006
Posts: 653
Location: A large Island called Vancouver
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| Posted: Wed May 11, 2011 8:05 pm Post subject: |
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| trag wrote: | | billabong wrote: | Apple said they were going to certify 2GB PC 2700 RAM when the mini first came out. Maybe they're waiting for the new models to come out before they announce it. Read the second paragraph down.
"Apple representatives on the Expo show floor confirmed plans to certify 2GB PC2700 RAM for the system, as well."
http://www.macworld.com/news/2005/01/11/macmini/index.php |
According to the Apple Hardware Developer Note, the G4 Mini has thirteen address lines, A0 - A12, and two Bank lines, BA0 - BA1, connected to the DIMM socket. DIMMs may have a maximum of sixteen chips. The DIMM is 64 bits (8 bytes) wide.
The address is multiplexed (used twice) so that's really 2 X 13 = 26 address bits available for 64M addresses. The two bank lines give another four possibilities so that 64M X 4 = 256M addresses can be accessed. So 256M X 8 bytes wide = 2 GB.
In practice, one would need to find a DIMM made out of sixteen 64M X 4bit X 4bank memory chips. The Micron MT46V256M4-6T or -5B would do the trick.
I've seen 2GB DDR DIMMs, but they've all been registered and/or ECC. I have yet to see a 2GB DDR DIMM which is unregistered and non-ECC.
Of course, one could also build such a DIMM out of eight 64M X 8bit X 4 bank parts, but that would be a 2Gb memory chip, and as far as I can tell no one makes/made a 2Gb DDR memory chip. They only went up to 1Gb. |
I take it you were not aware that the post you replied to was 6 years old? |
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trag
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Joined: 16 Jul 2010
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| Posted: Thu May 12, 2011 10:03 am Post subject: |
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| jb wrote: |
I take it you were not aware that the post you replied to was 6 years old? |
Yes, I was, but I read through the other discussion on the topic and found that no one had posted an analytical discussion based on Apple's (limited) disclosure about the operation of the memory controller in the G4 Mini.
Presumably there are still some G4 Mini aficionados on the list and the memory parts necessary to make such a DIMM have only become available in relatively recent years.
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