Actually nope, just had another freeze. :\
Before you can say its the motherboard, the RAM and GPU should be ruled out.
To test the RAM try some Prime95 Large FFTs with 80% of RAM used, and also try Memtest86+.
To test the GPU, try Unigene Heaven benchmark on loop for a good 10minutes or so.
Use HWMonitor to keep a check on CPU/GPU temperatures.
Only really by ruling everything out can the motherboard be put in to doubt.
Cross post for those who maybe are not visiting the Titan X thread
Benchmarks to gaming has all been smooth at 4k.
Overclock them now!