D3D_DRIVER_TYPE_REFERENCE: Creates a so-called reference device. The reference device is a software implementation of Direct3D with the goal of correctness (it is extremely slow because it is a software implementation). The reference device is installed
with the DirectX SDK and is available to developers only; it should not be used for shipping applications. There are two reasons to use the reference device:
(i) To test code your hardware does not support; for example, to test Direct3D 11 code when you do not have a Direct3D 11 capable graphics card.
(ii) To test for driver bugs. If you have code that works correctly with the reference device, but not with the hardware, then there is probably a bug in the hardware drivers.