16GB RAM on an iMac 24" (early 2009)?

I have been reading about this, but I can't seem to find an answer to my specific model..

In short, my question is, can I install two 8GB RAM (total 16GB) in my iMac?

I have the early 2009 version of the iMac 24" 2.93 GHz intel core 2 duo. I already have 8GB (2x 4GB) 1066MHz RAM installed.

I do very intensive photoshop art (the saved PSD files usually exceed 1GB, and while the document is open in Photoshop, it can exceed 5GB -- but of course PSD files cannot be saved over 2GB so I usually have to delete unused layers to reduce its size). I usually end up using more than 8GB of RAM for this (image files, with multiple layers, layer styles, etc, at 24,000 x 12,000 pixels of resolution, even in 8-bit 8GB of RAM is not enough).

I need more RAM, but I do not want to buy a new iMac just for this.

I know the official maximum is 8GB (4GBx2) which is what I have, but I know that when this model was released, there were no 8GB RAM easily accessible. Now there is, for under $200.

I want to upgrade to two 8GB sticks, to instease the RAM to 16GB, which would be exactly what I need. What should I consider? Is it possible?

Thank you.