there's a 7970 review on eyefinity and crossfire.
on BF3 it scales linearly...double the fps on CF compared to a single card
AMD Radeon HD 7970 CrossFire Performance Review - Battlefield 3
some single card eyefinity benches from tom's hardware
http://www.tomshardware.com/reviews/...-gcn,3104.html
now just imagine more mature drivers and overclocking on stock cooling/voltage to 1.1-1.2 GHz
what are the chances AMD will make the same mistakes and let the 7950 be bios flash-able to 7970?