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Extra RAM Slot...?
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Senior User
Join Date: Jul 2002
Location: Boston
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I'm sure I've asked this question before, but for the life of me, cannot remember the answer. When I go into System Profiler... why does it show 4 (four) RAM slots when there are only 3 (three) physical slots in my G4 533Mhz AGP Mac...? It shows the actual RAM slots with their correct memory sticks (asside from the PC-100/PC-133 thing) and it shows an additional "Empty" slot. Can someone remind me why it's doing this...?
http://www.rockkstar.com/memory.jpg <-- tooki says: ho huge inline images!
Thanks, in advance.
Peace.
(Last edited by tooki; Mar 2, 2004 at 10:33 AM.
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Moderator  Join Date: Sep 2001
Location: Arizona
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Wow. That is certainly interesting. Most of these little quirks that affect the Digital Audio machines also affect the QuickSilver machines since they use the same motherboard, but my QuickSilver reports 3 RAM slots as it should.
Odd...
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Senior User
Join Date: Jul 2002
Location: Boston
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Well... If I 'think' I remember correctly, which I probably don't... someone stated something along the lines of the system actually believing there's a fourth slot due to onboard memory or something odd like that... but I cannot make any sense of my inacurate recollection of those facts.
heheh... trust me... I went snooping around the inside of the machine looking for that 4th slot to shove another 512Mb in there. No dice!
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Senior User
Join Date: Jun 1999
Location: San Jose, CA
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Originally posted by LightWaver-67:
Well... If I 'think' I remember correctly, which I probably don't... someone stated something along the lines of the system actually believing there's a fourth slot due to onboard memory or something odd like that... but I cannot make any sense of my inacurate recollection of those facts.
heheh... trust me... I went snooping around the inside of the machine looking for that 4th slot to shove another 512Mb in there. No dice!
I know that one of the old G4 towers had 4 ram slots (can't recall which). Could it be that the motherboard in your machine has the spot for the 4th slot, but Apple just didn't put on the ram seat (much like the single 1.8 G5s have the area for the second CPU, but are just missing the cpu seat)
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Senior User
Join Date: Jul 2002
Location: Boston
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That has a familiar ring to it... we may have a winner...!!!
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Professional Poster
Join Date: Jun 2002
Location: Minneapolis, MN
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A computer lab here at school has Digital Audio machines in it... Apple System Profiler in 10.2.6 (that's what they're all running) claims four RAM slots. They're locked shut so I can't see if they actually have three or four, but LightWaver seems to confirm that there are only three present.
I know the Digital Audios had basically the same motherboard as the Quicksilvers that followed, with a 133 MHz bus and 4x AGP. PowerMacMan's G4 is a Quicksilver 2002, but my brother has a Quicksilver 2001. I'll have to ask him if it reports three or four RAM slots.
My G4 reports four, but it's a Gigabit Ethernet and I'm actually using all four of them right now.
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"That's Mama Luigi to you, Mario!" *wheeze*
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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Earlier G4 models had 4 slots (so did some later ones, once OS X came out), back when 512MB modules didn't exist yet, resulting in 1GB maximum RAM. Then the 512MB modules came out, resulting in a maximum capacity of 2GB -- but Mac OS 9 only supports 1.5GB RAM, and so to prevent from having consumers calling to find out why the expensive RAM they added doesn't work, they just removed the 4th slot. But if you look carefully, on a lot of boards, the location for the 4th slot is still there, there's just no socket (so it will be forever empty).
tooki
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Dedicated MacNNer
Join Date: Apr 2001
Location: lovettsville,VA,USA
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Originally posted by tooki:
Earlier G4 models had 4 slots (so did some later ones, once OS X came out), back when 512MB modules didn't exist yet, resulting in 1GB maximum RAM. Then the 512MB modules came out, resulting in a maximum capacity of 2GB -- but Mac OS 9 only supports 1.5GB RAM, and so to prevent from having consumers calling to find out why the expensive RAM they added doesn't work, they just removed the 4th slot. But if you look carefully, on a lot of boards, the location for the 4th slot is still there, there's just no socket (so it will be forever empty).
tooki
yep.
I have one of the early sawtooth G4s that has four ram slots all of which work. They are populated by 3x256k + 1x128k all of which show up in ASP. Does anyone know the actual maximum ram allowable running 10.3.2?
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Professional Poster
Join Date: Jun 2002
Location: Minneapolis, MN
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I know that if you're in OS X, you can put a 512 MB in each RAM slot and it'll see all 2 GB of it. In OS 9, though, it'll only see 1.5 GB.
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"That's Mama Luigi to you, Mario!" *wheeze*
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Professional Poster
Join Date: Feb 2000
Location: Nashville, TN
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mine shows 4 (3 phys)... if teh holes on the board exist, couldn't you add the socket
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Don't try to outweird me, I get stranger things than you free with my breakfast cereal.
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