Have you tried running Furmark on it yet? Let that run for a few hours, it will max out the power target, might help you crash earlier than 2-3 hours.
CPU: i7-5820K @ 4.3Ghz (-0.08V/1.33V Adaptive = 1.25V); Cache: 3.9GHz (1.20V); VCCIN: 1.85V @ LLC 6 12hr x265 (AVX2) Stable
CPU: i7-6950X @ 4.0Ghz (-0.08V Offset = 1.22V); Cache: 3.2GHz (1.06V); VCCIN: 1.90V @ LLC 5 12hr x265 (AVX2) Stable
RAM: 64GB @ 3000MHz (14-14-12-31 1T, 1.35V) 12hr GSAT Stable
GPU: EVGA Hybrid GTX 1070 @ 2076MHz Core, 8.6GHz VRAM, Stock Voltage 24hr [email protected] Stable