The more physical memory your VPS has, the more apps you shall be able to run at the same time. Some apps require loads of RAM even when nothing else is running on the hosting server, even though they may not demand high CPU speeds or lots of disk space. In case your server runs out of memory, it will stop responding and the sites and the offline apps that you host on it shall not function properly, as their software components shall not load since there won't be any free memory. In this light, we offer a RAM upgrade for our VPS packages, so if you notice that your web server is close to the limit, you may take advantage of this upgrade without upgrading the whole plan and paying for resources that you won't use. That way, you could ensure the proper operation of your scripts and stop concerning that your site visitors will see errors or will not be able to open your sites at all.