https://www.odroid.co.uk/ https://www.odroid.co.uk/ is the first result from duckduckgo. That should answer your 2nd question too. I bought an odroid some years

https://www.odroid.co.uk/ https://www.odroid.co.uk/ is the first result from duckduckgo. That should answer your 2nd question too. I bought an odroid some years ago (C1 maybe?) and I found quite a lot of things didn't work. I ended up paying quite a lot after the customs people had their way so I'd always go with a local distributor now. I could have returned it if I'd done that too. That xu4 link states it runs 16.04 but maybe that's also out of date info. The cpu performance sounds good but I think we'll have to disregard the pi3 comparison they provide as per the throttling the OP describes. Usb and network performance improvements would certainly be worth it for a NAS system, but then you don't get any sata ports. Gpio wise you've got a non-standard 2mm pitch header and 1.8V. What a pain. For me, the lack audio output and WiFi is a bit annoying. A media centre with a only hdmi1.4 would be a problem for some (you'd also maybe have to go for the slower one without a fan). Also remembering we are comparing a £42 device (I've included the official pi PSU) with a £70 device (+ if we want wifi). So maybe it's better compared against an atom board for those who want to spend a bit more. But an atom gives you sata so if that price comparison is fair (edit: had a quick look, it's not fair), the xu4 isn't that great. Maybe it is the use as a desktop system where the xu4 shines. I'm not convinced it's an obvious choice.