Introduction
Upgrade your RAM for an instant increase in speed.
Tools
Parts
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            Loosen the single Phillips screw in the center of the access door. 
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            Remove the access door from your iMac. 
 
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            Use the tip of a spudger to pull the black plastic RAM tabs out of the memory bay. 
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            Pull the black plastic RAM tab away from your iMac to eject the RAM module. 
 
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To reassemble your device, follow these instructions in reverse order.
5 comments
I believe the EMC2211 model requires PC2-6400 RAM chips instead of the PC2-5300 proposed here.
EMC2134 requires PC2-5300 as specified here. PH1 worked ok. Need to give RAM tabs a pretty firm pull to initially unseat, then it is easy to slide RAM back.
I don't see any 4 GB RAM chips? I currently have a 2 GB and 4 GB. Was thinking about changing out the 2 GB for a 4 GB. Would it support two 4 GB RAM chips? Do you not sell them?
PH2 head necessary to remove screw.
airshack -
Mine was as written, a PH1.
tpivo -