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I am upgrading my iMac’s RAM from 1.0 GB to 4.0 GB (2 x 2.0 GB cards). I have never opened up my computer before, so I’m looking for a little guidance if someone is able to help. Thanks a lot.

20-inch and 24-inch 2007 iMacs Model identifier: iMac 7,1, 2007 model Memory slots: 2 Memory type: 200-pin PC2-5300 DDR2 (667 MHz) SO-DIMM Maximum memory supported: 4 GB total. Use matched pairs of 2 GB per memory slot. Hard drive type: SATA II 3.5-inch hard drive Hard drive size supported: Up to 2 TB instructions Link (PDF)