Will this server work on Pfsense? ( Gigabit VPN AES-256-CBC)

[Ryu945]

http://www.ebay.com/itm/Mini-Desktop-PC-Intel-Core-i7-6700-3-40-8Gb-DDR4-WIN10-/131995730746?hash=item1ebb8f033a:g:jbIAAOSwFV9X0BoO

After much research and discussion, I think I found what i need. This will be used for Gb/s, OpenVPN, AES-256-CBC vpn it will be running.  This looks like the cheapest thing I can find so far for making a Pfsense router out of.  Do you see any potential problems with using this?

I plan on configuring it with:
4 Ghz CPU
16 GB DDR4 2400/2666 RAM
Z170 Motherboard
extra Ethernet port

[Guest]

I will not say it will not delivering your needed 1 GBit/s at the WAN interface, but real 1 GBit/s over
OpenVPN AES-256 and this symmetric would not be really able to imagine or expecting, only my mind.