What you need for crossfire click here
At least one of them needs to be a "crossfire edition" card.
Yes they will run VISTA........
.....but not DirectX 10 as those cards only support up to DirectX 9.
Surface Pro (2017) vs Surface Pro 4
Where HTML5 is headed next
MacBook Pro v Surface Pro 5
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.