You can get a great 4K and HDR TV for incredibly cheap these days – but there are 10 hidden costs you haven't thought of when you go to 4K

tcl 6 series tv roku 4k hdr

These new 4K TVs sure do look tempting, especially the new 6-series TVs from TCL that cost $650 for a 55-inch set.

That's a seriously budget-conscious price tag for a large TV that comes with 4K resolution and supports HDR – a feature that gives movies and TV shows a boost in color and contrast quality (at least for content that supports HDR).

I've tried TCL's earlier 5-series 4K HDR TVs, and they are absolutely fantastic. They also run on the same operating system as Roku's media streamers, which is great. It's like having a Roku media streamer built into the TV.

But upgrading to 4K from a standard 1080p resolution TV – which I'll call "HD" from now on – comes with a few extra costs that aren't immediately obvious when you're handing over your credit card information to pay for a new 4K TV. If you want to make the most of a new 4K TV, you'll need to upgrade a few things.

I've listed below 10 things that you'll likely need to upgrade to make the most of a new 4K TV. To be clear, you don't need to upgrade anything I've listed. However, you may be left wondering why you bought a 4K TV if you don't.

Check out what you'll need to upgrade if you buy a new 4K TV:

1. You'll need to upgrade Netflix if you have it.

For $11 per month, you get the HD resolution Netflix plan. But if you want to stream your TV shows and movies from Netflix in 4K, you'll have to upgrade to the $14 per month plan.

It's not a massive jump, but it does mean an extra $36 per year for 4K Netflix streaming.

Other streaming services like Amazon Prime Video, Hulu, and YouTube have 4K streaming built-in already.

2. You may need to upgrade your internet speeds.

Streaming video in 4K needs much faster internet speeds than streaming in HD resolution. Netflix, for example, recommends you have 25 megabits-per-second (Mbps) internet download speeds. For 4K streaming in Amazon Prime Video, Amazon recommends you have at least 15 Mbps download speeds.

To compare, HD streaming on Netflix uses only 5 Mbps.

The average internet download speed in the US in 2017 was 64.17 Mbps, according to the internet speed testing site, speedtest.net. That's more than enough for 4K streaming.

However, you should also consider buffering your internet speeds (pun not intended) in your internet plan. Two 4K Netflix streams could use up to 50 Mbps, for example. So if you think multiple people at home will be streaming 4K video, either from Netflix, Amazon Prime Video, or even YouTube, you should think about getting an internet speed plan that can handle heavy internet usage.

3. You may need to upgrade your video games console.

If you bought an original Xbox One of PlayStation 4 around the time they were released and you're thinking about getting a 4K TV, you may want to sell your console or give it away and replace it with a newer Xbox One S, Xbox One X, or PlayStation 4 Pro.

That's because Microsoft's and Sony's latest console models support 4K gaming and video streaming, and they'll help make the most of a new 4K TV.

A quick note about the Xbox One S specifically: This particular console only plays video at true 4K resolution. It does not play games at true 4K resolution. However, it does "upscale" HD games to 4K resolution, and it does a good job of it. So, if you don't feel like paying $500 for the Xbox One X, you'll be fine with the Xbox One S, which you can buy for under $250.

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