Interesting Project. But need to check how they implement things they promise mostly GPGPU Part.
VirtualBox dose not vitrualizing gpu... Just make some gpu emulation. CPU work good.
Yes, it is true. Virtualbox emulates the video card and it is not suitable for computation.
Artax uses OpenCL/CUDA device virtualization. Guest OS uses virtual OpenCL/CUDA device. This device is connected with host operating system via TCP port forwarding. At the operating system level, Artax interacts with OpenCL/CUDA device that is running on the GPU.
Please read the chapter "GPGPU" in the whitepaper.