6GB iMac memory upgrade for Mac Model ID 8,1. This machine was released in Early 2008. This kit contains one (1) 2GB module and one (1) 4GB module that are specifically designed and SPD configured for the iMac Intel running 800Mhz Memory.
Technical Specifications: 6GB (4GB + 2GB)DDR2-800,PC2-6400, , 800Mhz, Latency 5-5-5 , Non-ECC, Unbuffered, 1.8V, 200pin SO-DIMM (Small Outline Dual Inline Memory Module) format.
This module is compatible with the latest Apple Firmware.
The installation video will help on how to install iMac 8,1 memory on your machine:
If you need more product details about how to install iMac 8,1 memory on your machine, you can refer to the Apple's installation guide (PDF.)