ERROR: cuMemAllocHost() 2

[Zilent]

So, it works when running the benchmark with 1, 2 or 3 devices simultaniously, but not with all 4, that's when the error occurs.

c:\cudaHashcat-1.37>cudaHashcat64.exe -b --gpu-devices 2,3,4
cudaHashcat v1.37 starting in benchmark-mode...

Device #2: GeForce GTX TITAN X, 12288MB, 1076Mhz, 24MCU
Device #3: GeForce GTX TITAN X, 12288MB, 1076Mhz, 24MCU
Device #4: GeForce GTX TITAN X, 12288MB, 1076Mhz, 24MCU

Hashtype: MD4
Workload: 1024 loops, 256 accel

Speed.GPU.#1.: 31125.0 MH/s
Speed.GPU.#2.: 31173.3 MH/s
Speed.GPU.#3.: 31202.6 MH/s
Speed.GPU.#*.: 93500.9 MH/s

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Additional info:
There's no where near peak in host memory consumption when running for all 4 devices. It might be max just above 25% of the 32 GB (31,9) available.