is this benchmark right ? According to this benchmark 7850 crossfire is as good as gtx 780 or titan.
http://www.tweak.dk/review/HIS_Radeon_HD7850_4GB_%E2%80%93_CrossFire/1665/5/1
http://www.tweak.dk/review/HIS_Radeon_HD7850_4GB_%E2%80%93_CrossFire/1665/5/1