Cheapest video card for 4K monitor

Jun 20, 2018
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I have an old desktop with Intel Core i7-2600@3.4 GHz and AMD Radeon HD 6600 series graphic card (Dell XPS).

Now I have purchased a 28 inches 4K Dell monitor (S2817Q) and connected it to my desktop via HDMI (don't know the version).

But I have only 1920x1080 maximum resolution and I suspect it is because of the old graphic card.

What would be the cheapest graphic card that supports 4K monitor?

I don't play games. I only web-browse and watch movies.