Replacing the graphics card of your Dell computer is very complicated, and it is impossible for an individual to install it. In order to avoid unnecessary losses, you should go to the after-sales department to replace it.
You can call Dell's after-sales service telephone consultation: call 800-858-2969 from the fixed line; Call 400-886-86 10 from your mobile phone.
Provide you with the website of Dell repair station: after www.dell.com.cn/cis enters, choose the appropriate after-sales department.