Not long ago, some blurry photos of the GeForce GTX 750 and GTX 750 Ti PCBs (printed circuit boards) emerged, saying that while the GTX 750 Ti had a 6-pin power connector, the non-Ti didn't.
The rumor has now been proven false by another leak, one that shows the GTX 750 PCB without the cooler. Sure enough, there is one 6-pin power input there, on the upper right corner.
You can see in the die-shot that this really is the GTX 750, because the GPU used is the GM107-300 instead of GM107-400.
Other than the 6-pin power plug, the new photos show a 2+1 simple VRM (voltage regulation module), and a single-fan cooler (black shroud).
The NVIDIA GeForce GTX 750 and 750 Ti will come out on February 18, supposedly, so there might or might not be other leaks until then.