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CWWK NAS mini-ITX motherboard features six SATA connectors, three 2.5Gbps Ethernet ports
(www.cnx-software.com)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Why GPU? Just get an Intel CPU with quick sync.
This board already comes with a pretty weak celeron CPU and I'm pretty sure it's soldered on. An external GPU could really help with transcoding.
Exactly this.