Quote from: themerkle on November 26, 2015, 08:58:23 AM

If you always wanted to run a Bitcoin node but did not want to spend $40 plus shipping on a Raspberry Pi, fear not because an even cheaper alternative is here. Today, the UK based company released the Raspberry Pi Zero, a brand new model priced at only $5. It includes a 1Ghz processor along with a Micro SD slot, USB outputs, HDMI output, and a few other components which are included in the other Raspberry Pi models.

Surprisingly, the tiny board is 40% faster than the original Raspberry Pi 1. At such a low price, you can setup a bitcoin node for about $15, factoring in shipping and the micro SD card costs. The Raspberry Pi Zero comes preinstalled with full Raspbian, along with an installation of Minecraft. The Pi Zero shows just how cheap computers are becoming, which is leading us into the next revolution IOT.

Read More: http://themerkle.com/news/running-a-bitcoin-node-just-got-cheaper-with-the-5-raspberry-pi/

You can run FreeBSD out of the box, on 512mb and still have plenty of room.
That's without swap to.
With swap you can run apache, mysql and possibly bitcoind at the same time, without a problem (unless you drop in PEAR or some other high level memory hog)