hello member. i want to buy a GPU though i am a casual gamer. i like to play action and shooting games like battlefield, call of duty, assasin's creed, devil may cry etc. so far i was playing these games with my built in graphics which is intel G41 express chipset. so i am a noob in buying GPU. i don'i know much about in GPU. here is my some pc's configuration
processor: Intel quad core
motherboard: Intel DG41RQ
PSU: 400W (don't know the name)
And the most important thing is the budget is 4k-9k taka.
Please guys suggest me which GPU will be suitable for me. And what things should i know before buying a GPU.