The DPI myth, RAM & the higher/bigger/more is better mentality

Resolution, device manufacturers are all about it. You want the maximum resolution possible right? And RAM, more RAM is always better right?

Well, it depends.

First let’s talk about the DPI myth. The human eye’s maximum resolution is around 350 DPI, one foot from your eyes. It roughly halves every extra foot away. Most people are probably going to hold their tablet at around one and half to two feet away from their eyes, or reading, maybe around a foot. That means that for example the teclast 8.9HD @ 2560×1600 @ 339 DPI is around the maximum resolution the eye can see, even when holding it close to your face for reading. And 1080P is going to be maximal for anything where the tablet is held more casually. Basically a good high resolution can be of benefit, but there is also a limit to what you can see.

On top of that higher resolutions do drain battery more, and slow down processing. So if you have a high resolution, you want a battery that can match it. And if you have lower resolutions, it may make the device run faster.

And what about RAM. Well a windows tablet can easily make use of more than 2 GB of ram, although for most purposes 2 GB will be fine, unless you want to run complex programs like games. But for android while 2 GB makes a decent difference, above that is kind of redundant – there is nothing much that powerful in android apps that demands that much power.

So to some degree, more is better. But if you understand what the numbers mean, you can make better choices about what kind of hardware you might use. For example, going for a larger battery, with a less HD screen, will mean your device can run faster and for longer. And internal storage speed is not something to be ignored either. Thankfully the modern tablets usually run a fast eMMC which can go up to 150 MB/s. That’s plenty fast enough.

But some older hardware has much slower internal storage, something more like 20 MB/s, and that is what in computing we call a bottleneck – the slowest transfer rate is the limiting factor – a slow internal storage will slow your device down. So make sure you choose a device with fast internal storage, something modern.

And for windows, 32 GB isn’t a lot to play with for applications. You’ll want either 64gb internal storage, or to add an external microSD card. You can get wireless drives for media storage, and I will be working on getting some of those in stock, that way you can use your internal space for programs and apps, and store your movies, documents, magazines, books and music on an external drive if you wish to.