http://nguipxnkrp3qrzrlduhsatpcpwehnblzmlkc5ifiumxq4z5jlh4lwvid.onion/os_archive/os_OPSEC_357.html
If you're doing something that doesn't need speed (writing and sending email, text browsing, low impact web/mail servers) use older hardware, if it needs speed (rendering, gaming, 1080p streaming video, number crunching,) then use something modern but only for that task (and for nothing else).