Any suitable 64 bit x86 embedded dev kits/platforms?

I realise there’s a ton of reasons why ARM firmware makes so much sense - but given the possibility to use WINE etc - and current commercial plugins from the big players only run on x86 ( Apple native being the exception ) are there any relatively low power dev boards or embedded motherboards suited to fanless operation that support 8GB RAM or more?

replied in a similar thread, so closing this one