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Raspberry Pi launches its IPO
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
That'd be fine. Laptop cooling fan might die from being on all the time as well as mechanical drive issues at that age but it's solid hardware otherwise. Pihole is not overly intensive. Ideally make sure the pihole machine is on a wired network connection inside your LAN, because wifi routing latency will be bad otherwise. So that may necessitate a thunderbolt ethernet adapter, but I've bodged together much worse before lol.