4GB iMac memory upgrade for Apple's Early 2008 Model ID 8,1. Includes a single 4GB memory module that is specifically designed and SPD configured for the iMac Intel CPU running 800Mhz Memory.
4GB PC2-6400, DDR2-800, 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.)