iMac RAM Upgrade Question, Folks

Salutations folks, I've just arrived here and have a quick question:

Can I use Kingston HyperX 4GB (2x2GB) DDR2 PC2-8500C5 1066MHz Dual Channel in my early 2008 iMac 20"?

The serial lookup site states my spec is:

Installed RAM: - 1 GB
Max. Amount: - 4.0 GB
Amount of Slots: - 2
RAM Speed: - 800 Mhz
RAM Type: - PC2-6400, DDR2, SO-DIMM.

Cheers