The more physical memory your VPS has, the more applications you will be able to run simultaneously. Some applications require a lot of RAM even when nothing else is running on the web server, even though they may not demand high CPU speeds or a lot of disk space. If your server runs out of memory, it shall stop responding and the sites and the offline applications you host on it won't work adequately, 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 Virtual private server plans, so if you notice that your machine is close to the limit, you could take advantage of this upgrade without upgrading the whole plan and paying for system resources which you won't use. This way, you can guarantee the proper performance of your scripts and stop concerning that your website visitors will see errors or won't be able to open your sites at all.