The more physical memory your VPS has, the more apps you will be able to run at the same time. Some pieces of software require a lot of RAM even if nothing else is running on the server, even though they may not require high CPU speeds or loads of disk space. In the event your web server runs out of memory, it will stop responding and the sites and the offline applications that you host on it won't work adequately, as their software components won't 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 machine is close to the limit, you could take advantage of this upgrade without upgrading the whole package and paying for system resources which you won't use. In this way, you could guarantee the proper operation of your scripts and stop concerning that your visitors shall see errors or will be unable to open your sites at all.