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In Windows, it's possible to use SD card as RAM.

Is something similar possible in Android (with and without root)?

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Yes it is. As on Linux, it's called Swap. It might be useful on devices with minimal RAM (512MB and less), but unlinkely on those coming with 1GB and more.

There are apps available helping you to configure swapping. You find most of them searching for swapper.

  • @user62355 note that most of these apps will only resort to using flash memory for background apps. This is because it is not nearly as fast as actual RAM. If you need more RAM for cpu-intensive tasks, then you should get a new phone. – KevinOrr Jul 27 '14 at 18:21
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    @KevinOrr agreed. But for Windows that's the same (RAM is the fastest memory in a device) – with the only difference that there you can buy new RAM instead of a new computer ;) – Izzy Jul 27 '14 at 22:39
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    Oh yeah. Totally agreed. But that's true: it's a shame that our can't do that with mobile devices. Actually, maybe with Project Ara! :O – KevinOrr Jul 28 '14 at 4:35
  • I think OP meant ReadyBoost, which saves some RAM by moving HDD's lazy-write cache to Flash. Anyways, onboard eMMC is faster than TF. – Free Consulting Aug 15 at 4:04

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