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.


Please see the other thread where i replied to your question.