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The aim is for it not to be connected to anything. I currently have a crappy TV that can barely manage HD let alone 4K, so at the moment everything is going via a chromecast or a miniPC I have plugged in. Will have to think about the best client to connect to the TV as don't think we want a computer in the lounge...
Sam_w-
You may not need a client at all.
Not a separate one anyway.
Either ChromeCast and send it from your phone using a Plex client on your phone (I do this sometimes when I don't know where my TV remote is!).
Or if you buy an Android TV or an Apple TV thing, then both have Plex clients. Which means you won't need another box in the room.
All of the above will force the Plex server to transcode though, hence the "get a decent CPU in the Plex server".
Velocio
One last question... will the Plex server be just a Plex server?
i.e. will it be in a basement, and other clients connect to it?
Or will you be connecting this to the primary TV in house that happens to be a 4k beast, and on the Plex server you'll also run Plex Media Theater?
If the former, the graphics card is irrelevant, if the latter than you'll want a decent graphics card that can be passively cooled when not in use.
I went with this one: http://www.amazon.co.uk/Gigabyte-Nvidia-Graphics-Cards-128-Bit/dp/B00UMVCYTM
It's got hardware decoders for the core video codecs you're likely to have, and the large fans are silent when it's hot, and when it's cold it's decent enough to turn the fans off entirely (saves power, keeps the room silent).
But this is not needed if the Plex server is not going to be connected to a TV. Mine is connected to a 4K TV and so I went for a 4K graphics card that can be silent.