I asked everything I wanted to know about graphics cards and the most suitable one for my machine. Thanks for your suggestions SPN.
I was facing problem installing Photoshop application on my windows pc and searched internet for help. There I found SPN and called them, and their technician somehow installed the application and I am really thankful to him and SPN.
Amazingly fast service by the technician, he fixed the slow speed issue of my computer. Now, I have subscribed to SPN 6-month plan and hope they will take care of my device.