I don't know how I managed to post my suggestion in the wrong sleeper thread, since I didn't even search. but here it goes, with the dangers of doubleposting:
I'm curious to what settings you used in Blender with the BMW benchmarking test, did you just Download it, run it by pressing F12 and go? Or did you tweak the settings
to optimize for your Workstation build?
If not, you should.
I get a benchmark result of 42.90 Seconds on the BMW (gpu) test, with a Zenith Extreme Motherboard with a 16 core (1950x) Threadripper, and watercooling, no overclocking, with an Asus 1080ti Strix OC edition.
But I fully expect your rig to be able to get at least 40% more performance than mine. At 120 - that seems a bit underwhelming to me for a rig like that, try setting the Render Tiles settings to x 16 and y 16 instead of the default 256. This would optimize the render performance for your particular GPU.
Also go to preferences and enable both GPU and CPU for rendering.
Use Blender 2.8 Beta for this.
please post your results, I'm sure we're quite a lot of people out there that's curious about the results.