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Even high-end 4K TVs, like this Samsung JS8500, have a true refresh rate of at most 120Hz. Sarah Tew/CNET There's a simple rule of thumb for companies that market electronics: When it comes to specs, a higher number is usually preferred. Sure, there are exceptions -- you want things like response time, load times and mobile device weight to be low -- but generally, more equals better. It comes down to the 'speeds and feeds' aspect that still dominates a lot of tech shopping: When you line up a bunch of similar TVs, phones, laptops or tablets, the ones with the higher numbers get the edge. Think about battery life, display resolution, screen size, processor speed, memory and storage capacity, to name just a few.

Of course, the quoted number is often only half the story. Consider the megapixel myth of digital cameras: a 15-megapixel camera isn't necessarily going to yield a 'better' picture than an 8-megapixel shooter. Nor is a -- with a resolution of 3,840x2,160 pixels -- going to necessarily outshine a 'standard' HDTV with 1,920x1,080 pixels, or just one-fourth of the 4K screen's resolution. Plenty of other factors, including color accuracy and contrast ratio (not to mention the quality of the video source) will affect the picture quality to a normal eye. Then there's refresh rate. This spec refers to the number of times per second that a video screen is updated, with a higher number yielding a smoother, more natural-looking motion (up to a point).

The baseline for this number was set back in the last century, with movie projectors hitting 24 frames per second (expressed as a frequency in Hertz, or Hz), and old standard-definition TVs set at 60Hz in the US or 50Hz in many other countries. In the HD era, though, TV manufacturers started an arms race of sorts, ramping up refresh rates in increasing multiples to 120Hz, and even eventually 240Hz. There was even a time where some plasma TVs were claiming, somewhat dubiously, a of sorts: the 'more equals better' situation again.

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So, now that we're in the post-HD 4K TV era, we're clearly up to 480Hz, right? Or possibly 960Hz? The fact is that nearly all of these new 4K TVs -- which now make up the increasing majority of all TVs priced over $1,000 in the US -- have, at best, a 120Hz refresh rate. Actually, many of the least expensive 4K sets are 60Hz, and none that we know about are 240Hz.

You may be asking yourself, what's with all the 4K TV marketing that claims numbers of 240 or even higher? Well, they're fluff. Very carefully worded marketing fluff, in most cases. But does that mean those of you trading in a recent 240Hz 1080p TV for a bigger, sub-240Hz 4K Ultra HD TV are actually downgrading your picture quality? The answer, as always, isn't so cut and dry. 1:30 What's refresh rate?

To recap: is how often a TV changes the image (also known as a 'frame') on screen. With traditional televisions, this was 60 times each second, or '60Hz.' Some modern TVs can refresh at much higher rates, most commonly 120Hz (120 frames per second) and 240Hz., with 1080p HDTVs, but it's the same idea. But is this just yet another 'more is better!' Marketing ploy?

Do the bigger numbers matter? Actually, they can: Higher refresh rates on -- which, post-plasma, are pretty much the only two mainstream TV technologies left -- can help decrease motion blur. What's motion blur? Glad you asked. Your brain on blur All LCD and current OLED models suffer from 'motion blur.' This is where anything in motion, either an object moving on screen or the entire image (like when the camera pans), blurs and looks softer than if it was stationary.

Geoffrey Morrison/CNET Interestingly, this blur is largely created by your brain. Basically, your brain notices the motion, and makes assumptions as to where that object (or overall image) is going to be in the next fraction of a second.

The problem with LCD and current OLED TVs is that they hold that image there for the full 60th of a second, so your brain actually smears the motion, thinking it should be moving, when in fact it's just a series of still images. It's actually quite fascinating, but the details are beyond the scope of this article.

I recommend checking out. The motion blur we're talking about here is caused by the television, on top of whatever blur the camera itself creates. Some people aren't bothered by motion blur. Some don't even notice it.