Just to verify that this 4GB memory has been installed and works for the base imac MB323LL/A:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227251&Tpk=20-227-251
Or this:
http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=B6489527A5CA7304
It seems that the Crucial recommended memory has a CL=6, which is different then the CL-5 of the Newegg OCZ memory.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227251&Tpk=20-227-251
Or this:
http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=B6489527A5CA7304
It seems that the Crucial recommended memory has a CL=6, which is different then the CL-5 of the Newegg OCZ memory.