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). Also assume that you're being keylogged if you're connected to the internet on a modern operating system (including linux and bsd) on a modern hardware machine (Anything >2005).