My iMac has 2x2GB SODIMMs. Should I install 1x4GB SODIMM or 2x2GB?

The topic says it all..
Installing more RAM in my iMac.
Have 2x2GB that came with the machine
Can I install 1 more 4GB SODIMM or should I install 2x2GB?
Is there any difference in performance between the two or am I not with the times?

Just add the 4GB modules as you can afford them. Running with uneven sized RAM cards has very little impact on speed in the real world whereas the more RAM the better is always true.

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