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Hi,Your iMac is in fact the 2007 model, not 2008. The 2008 model had either a 2.4Ghz or 2.66Ghz processor, yours has a 2.0Ghz processor. You can double check this by entering your serial number on Apple's support site. That is why the 800Mhz RAM chips weren't working - they are for the 2008 model.You need 2x 2Gb PC2 - 5300 667Mhz DDR2.Hope this helps.