Memory needed to host 200 wordpress sites?

I’m planning to use Multisite to host 200 different wordpress blog with each having their own unique subdomain. I notice each time I create a virtual host for each subdomain it’ll use roughly 50mb ram. So if 50mb * 200 sites = 10GB RAM correct me if wrong is 10GB of RAM needed to host 200 sites? if possible is there solutions to decrease ram usage?

The actual RAM you need depends on many factors:

• plugins
• theme
• installed extensions (server and PHP)
• the current operation (editing images needs the most)
• translation, some translation files are really heavy

In a multisite, some resources are shared, the server setup for example is not duplicated each time you create a new site.

You can save some resources if you enable the built-in Opcache, check your theme and the plugins with Xdebug. There is not much you can do with translations.