I tend to use most of my RAM and I have 16GB. I tend to do a lot of dataset/number crunching and have a few different services running at once. I tend to see t

I tend to use most of my RAM and I have 16GB. I tend to do a lot of dataset/number crunching and have a few different services running at once. I tend to see that as an extreme case though. For everyday web dev 8GB seems more than sufficient. I wouldn't say it's a requirement, but if you can opt for it you might as well. RAM is cheap.