We are going to need more info...
Specifically what Resolution do you play at (1080p, 1440p, 4K, etc). What is your preferred budget ($100-$1000), finally what Intel CPU precisely and how big is your Power Supply?
If you don't know your system specs i suggest you download and run this tool, it should take about 60 seconds and will list your Monitor resolution, CPU, RAM, etc so we can help identify the best Graphics Card for you.
Link >
http://www.userbenchmark.com/Software