Comment by Aachen

Moving bytes around doesn't take RAM but CPU. Notice how switches don't advertise how many gigabytes of RAM they have, but can push a few gigabits of content around between all 24 ports at once without even going expensive

Also, the HN homepage is pretty tame so long as you don't run WordPress. You don't get more than a few requests per second, so multiply that with the page size (images etc.) and you probably get a few megabits as bandwidth, no problem even for a Raspberry Pi 1 if the sdcard can read fast enough or the files are mapped to RAM by the kernel