Install ssd 128G

I got a gateway sx 2185, which is a mini desktop. I dont know how am I able to install this new-bought sandisk SSD. Also, all the installation guide I read is told me to replace the original hard drive and back up the data, what if I just wanna add SSD as additional hard drive, is that possible? My desktop running well, but when it comes to some large 3D game, slowness shows up. I just want to install all the game into SSD to make them run faster.


in that case you can just plug the ssd on an available sata connection, format the drive in the disk managment or in the bios and use it normally as a second storage device.