ethos42,
i7 5820k (OC to 4.0), 32gb DDR4 2666, GTX 980 TI, Intel 750 400GB SSD, Windows 10. Playing with a resolution of 6000x1080 (3 monitors using nVidia Surround)
https://forums.ashesofthesingularity.com/467689/page/7/#3594536
Taking from your hardware setup, have you tried removing your overlock on your CPU, and also stepping down from 3 monitors down to a single and see if the benchmark runs thru to completion?
Can you open your Task Manager, have it running during the benchmark, and immediately when it crashes, take a screenshot showing up the load on your CPU/RAM?
Also, if you have MSI Afterburner running, can you use it to again take a screenshot to show us the load on your GPU at the time of the crash?