These very small "problems", are a waste for the long, complicated compute threads of modern CPUs: the CPU is "done" with it very fast, but it has to wait for the next problem in queue to come up. It is an "unbiased" method that uses brute force to literary calculate ray by ray and bounce per bounce of light for the whole GI solution. VRay RT GPU, is another rendering method, different and not 100% compatible with all the features of Vray Advanced (yet). The fact that machines labeled as "workstations" marketed to people "rendering stuff" come options that contain "workstation" GPUs, mainly Quadros & Firepros have nothing to do with "rendering" itself.ΔΆ. Will make virtually no difference rendering something on a workstation with "on-board" graphics/IGP, GTX 780, GT 610, Radeon 7750 or any Quadro. It will get there, but it is not right now. The GPU is not used for any aspect of "normal" renders with VRay advanced, Mental Ray or any other traditional renderer.
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