NVIDIA Kepler Yields Lower Than Expected.

[sergionography]

For Nvidia Surround (3 monitors) you need two cards. For AMD Eyefinity you only need one.

which is why amd graphic cards are more bandwidth hungry than nvidia
and explains why nvidia is releasing a 256-bit card to compete with amds hd7970

The other way around.

for multi-monitor on nvidia you have to SLI, while for eyefinity you can use one amd card, thats what i was referring to, in other words the hd7970 needs that extra bandwidth more than the gk106