iMac RAM Model ID 5,1 and 6,1 DDR2 667Mhz
The iMac 5,1 and 6,1 have a system maximum of 4GB. It is important to note this does not include the iMac 5,2. The Late 2006 DDR2 SDRAM for iMac machines are specifically designed and SPD configured for the iMac Intel running 667MHz Memory.
Specifications: PC2-6400, DDR2-667, 667Mhz, Latency 5-5-5 , Non-ECC, Unbuffered, 1.8V, 200pin SO-DIMM.
This module is compatible with the latest Apple Firmware.