I'm currently using a laptop with 4GB of memory with a 32-bit windows 7. I have a C++ IDE, a Notepad, three Wordpads, two Windows explorer folders, and a total of 87 tabs in FireFox (though many of them aren't loaded) open. I'm serious: my computer is running fine.
Now, in video editing, your amount of RAM effects how much of the video at a time you can preview at live speed in the editor. Let's say with 8GB you can store one minute of video. With 12GB you could store a minute and a half. Unless you're going to be doing this all day as a profession, you likely won't even notice the difference. As far as I know (which isn't very far), lack of ram won't hold your computer back, it'll just make it slower.
Unfortunately, I don't know the answer to your original question. But I'm interested in the answer too, so I'll see if I have any luck with google.