The power!

[Gogan]

I ended up rebuilding my pc recently (PSU died and bricked my ssd drives). So I started to entertain going 4k and thus looking at dual 980s in SLI or the Titan X.

Learned an interesting tidbit about the Titan X... since it's a 12GB card, your system effectively needs 24GB of memory to use it. The catch is, Window 7 Home Premium (64-bit, ofc) maxes out at 16GB.

FWIW, it sounds like 4k tech is still super immature despite prices dropping. Not worth the trouble yet.