hope to get solution
The problem is most likely your GPU as it is underpowered for 4k. The gt 630 is, according to nVidia, only available in 1 or 2gb configurations not 4gb. You would be better off with a GTX 1080 or higher.
Unless you have a nuclear-powered computer, best way to deal with 4K editing is to use proxy files. Do a search to learn how this is done.
You can refer this post.
GeForce GTX 1050 TI OC edition is a good choice for 4K video editing. I personally use that
This is my budget 4K Configuration
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