I fail to see the advantages of these cards, no matter which way you slice it.
You need 3x the number of motherboards, memory, hard drives, power supplies and all other supplies to match 4x 280x cards. You need at least 11 of the 750ti cards to do so. 11x 60watt = 660 + 3 motherboards and other components (910w total if you want to be conservative).
VS.
1 motherboard and all other components + 4x 280x cards = WAY cheaper to put together, and draws 1125w of power BEFORE undervolting. Extra power draw is negligible.
PLEASE explain to me why anyone sane enough would bother with low end NVidia cards?
we are not talking about setting up a rig with 750Ti. we are discussing the possibilities when high-eng cards with Maxwell architecture (the same that 750Ti uses) are released by NVIDIA, the advantage will be on NVIDIA side, because the cards will have hashing power same or greater than amd and will be much more power-efficient.