Here are my initial results with six 750 Ti FTWs at +40 core (1360-80mhz-ish) and +550 memory.
http://i.imgur.com/jUkbGPD.png81w idle and 547w mining scrypt. 3.46 K/hash per watt.
Powered usb 3.0 risers, MSI Z77A-GD65, 1000w Raidmax gold psu.
I tried to use 7 cards but my system won't even post with it physically plugged into in the last slot.
Overall, a nice inexpensive upgrade from my three 670s. The default 42% fan speed noise level is ridiculous though.
