I have an older desktop, Gateway DX4320 with an AMD Phenom II X2 820 Processor 2800 Mhz 4 cores and 6 GB of RAM. It's only called up on for web browsing, streaming, playing DVD/digital video and other light tasks, which it seemed to do with ease when it was newer. It has a quite old hard drive that used to be quite fast, but it certainly doesn't seem that way anymore as it is constantly churning. The system moves at a crawl. How can I assess whether it is worth slapping a new SSD in and whether I will need anything more than a 3.5 to 2.5 cage adapter for the install?