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1024Mb in iMac !?
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Grizzled Veteran
Join Date: Jul 2003
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Hi,
I would like to have 1024Mb ram in my 800Mhz iMac from 2002. I noticed however on Crucial's website that the DIMM ram in my iMac is not modifiable. Is this true or do I just have to take it out with force ? Also, what type of DIMM ram is it ? What speed and pins ?
(Last edited by Fonzie; Feb 14, 2004 at 09:10 AM.
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There's No Offposition On the Genius Switch - David Letterman
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Professional Poster
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Originally posted by Fonzie:
Hi,
I would like to have 1024Mb ram in my 800Mhz iMac from 2002. I noticed however on Crucial's website that the DIMM ram in my iMac is not modifiable. Is this true or do I just have to take it out with force ? Also, what type of DIMM ram is it ? What speed and pins ?
It's PC133. If you flip the thing upside down, there is a door on the bottom. You have two DIMM slots there. They are both changeable. Make sure you have the latest version of the firmware (4.1.9f on the slot loaders).
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ACSA 10.4/10.3, ACTC 10.3, ACHDS 10.3
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Grizzled Veteran
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Originally posted by Detrius:
It's PC133. If you flip the thing upside down, there is a door on the bottom. You have two DIMM slots there. They are both changeable. Make sure you have the latest version of the firmware (4.1.9f on the slot loaders).
hmm last time I checked ( when I put in 256Mb ram) It didn't look like the DIMM ram could be replaced. It's very solid, I think.
How many pins is PC133? 133 ?
BTW. One of the ramslots is SO-DIMM 
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There's No Offposition On the Genius Switch - David Letterman
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Originally posted by Fonzie:
hmm last time I checked ( when I put in 256Mb ram) It didn't look like the DIMM ram could be replaced. It's very solid, I think.
How many pins is PC133? 133 ?
BTW. One of the ramslots is SO-DIMM
Regular PC133 DIMMs have 184 pins. Small Outline (SO) DIMMs have 144 pins. The 133 means 133 MHz, the maximum speed the RAM is rated to run at, which usually matches the bus speed of your computer. 133 RAM can also operate at the older, slower speeds of 100 and 66 MHz. But that's not all that important right now.
If you want 1024 MB, you need to put a 512 MB chip in the user-replaceable slot (at the bottom of the iMac in the SO-DIMM slot, plus 512 MB in the slot in the upper part of the base (with a regular 184 pin DIMM slot). You might have to get an Apple certified tech to do this, I'm not sure if that will void the warranty or not. It's not a good idea to take it apart anyway. I've got 1024 MB in my slot loader, but both slots are easily accessible by the nifty door on it's behind.
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If I'm not mistaken you can get up to a gig of RAM in all iMacs 350 mhz and above.
Beetleboy
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G4 17" iMac 1.25 Tiger
G3 Lime iMac DV 400 Tiger
G3 Snow iMac SE 700 Panther
G3 Graphite iMac DV SE 400 Panther
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Originally posted by bradoesch:
Regular PC133 DIMMs have 184 pins. Small Outline (SO) DIMMs have 144 pins. The 133 means 133 MHz, the maximum speed the RAM is rated to run at, which usually matches the bus speed of your computer. 133 RAM can also operate at the older, slower speeds of 100 and 66 MHz. But that's not all that important right now.
If you want 1024 MB, you need to put a 512 MB chip in the user-replaceable slot (at the bottom of the iMac in the SO-DIMM slot, plus 512 MB in the slot in the upper part of the base (with a regular 184 pin DIMM slot). You might have to get an Apple certified tech to do this, I'm not sure if that will void the warranty or not. It's not a good idea to take it apart anyway. I've got 1024 MB in my slot loader, but both slots are easily accessible by the nifty door on it's behind.
You sure give a good explaination! Thank you. I now understand.
edit. I tried looking at Crucial's website. Is the memory I need in the DIMM slot SD-RAM or DDR-RAM? If it's sd-ram then I can only choose 168pins.
(Last edited by Fonzie; Feb 14, 2004 at 09:10 AM.
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Originally posted by Fonzie:
You sure give a good explaination! Thank you. I now understand.
edit. I tried looking at Crucial's website. Is the memory I need in the DIMM slot SD-RAM or DDR-RAM? If it's sd-ram then I can only choose 168pins.
No problem.
The page I found for your iMac is here. It lists 128, 256 and 512 MB sizes of PC133 SDRAM memory in the SODIMM size. These modules fit the user-replaceable slot only. If you'd like the full 1 GB, you need a regular size 512 MB PC133 SDRAM DIMM as well.
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Does anyone know for sure if the Imac (older or newer)will accept the 1 gig stick in the user slot and recognize more than 1 gig of memory?
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hmmm, Guess no one has tried this yet?
I'm just curious because it's a configuration issue for me. I am about to get a new 20" Imac and I don't want to waste the money for the 1 gig SoDimm if it won't use 1.25 gigs of ram. Might as well get it with a 512 in the Apple slot and add a 512 here instead of the 1 gig.
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those are decent instructions however i see one major problem. When putting it back together you have to reapply thermal grease to the heat sink. I have seen processors get fried like thise cause people didnt know what they were doing. And yes, installing this yourself technically does void your warranty
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PC133 SDRAM DIMMS have 168 pins.
SO-DIMM SDRAM DIMMS have 144 pins.
The internal slot is not user servicable according to Apple. You have to use heatsink compound when reassembling to make sure that the iMac stays as cool as Apple intends it to be.
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If this post is in the Lounge forum, it is likely to be my own opinion, and not representative of the position of MacNN.com.
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I agree, from all I have heard and seen, it is really best for the average user not to mess with the "Apple Slot". So what most should be concerned with is how to add memory to the "User Slot" which is much easier to access and doesn't require the extra proceedure of applying the Thermal Lubricant.
However, I would really lke to hear from anyone who may have tried a 1 gig SoDimm in the user slot and if, in fact, the machine is recognizing 1.25 gigs of ram (or more in the case of a 512 meg in the Apple Slot)
I'm curious because the current Imac is only rated for a maximum of 1 gig of Ram. The recent availablitiy of single 1 gig SoDimms would appear to provide a reasonable method to upgrade even a stock unit with 256megs and not have to worry about messing around with the Apple Slot. But, if the machine won't use or even see the additional 256 megs (over the 1 gig) then this option isn't worth the cost.
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I read that the new 20" iMacs can do 2GB of DDR Ram.
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