Hello,
Thanks for the question! The Power Hosting plan is hosted on something called a shared server, so resources are shared. There is no set limit and it will vary from server to server, so we can't really give you a specific number. This doesn't mean that if the server has 16 GB RAM, that you can access it all, but it does mean that your site may have access to a large pool of resources for a period of time. You will also be able to monitor your resource usage using the graphs in your cPanel. PHP.INI typically defaults to 512 MB but you can change that value using a text editor to edit your local php.ini file.
I hope this helps to answer your question, please let us know if you require any further assistance.
Regards,
Arnel C>