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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > 24" C2D White iMac, what's the maximum RAM possible?

24" C2D White iMac, what's the maximum RAM possible?
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Professional Poster
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Jul 24, 2011, 04:49 AM
 
Everymac says 3GB, but then my MacBook has 4GB in it which according to Apple and the crucial.com RAM wizard shouldn't work. So will 4GB go in a 24" C2D White iMac or is it really 3GB?

What are the differences between the White iMac "Core 2 Duo" models? @ EveryMac.com

(It's not my mac, I've been asked the question)

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Jul 24, 2011, 05:00 AM
 
3 GB.

Four will *work*, but only three will be used.
     
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Jul 24, 2011, 05:29 AM
 
What Spheric said. The upper 1 GB cannot be addressed by the Intel chipset.
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ajprice  (op)
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Jul 24, 2011, 01:12 PM
 
FIne, the iMac chipset must be the same as my MacBook then. I've looked in About This Mac and the System Information screen from that, and they both say I've got 4GB from 2x2GB memory modules. Does it say anywhere in the system that its actually reading 3GB and not the whole 4GB?

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Jul 24, 2011, 11:52 PM
 
Open Activity Monitor, choose the System Memory tab. The total usable RAM is printed below the pie chart. You can also add up the four categories (Free + Wired + Active + Inactive) or (Free + Used). Each of these should total to your usable RAM.
     
   
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