Video Card needed for Virtual Reality DICOM viewing

What are minimum video card and RAM needed to view DICOM MRI/CT or moving echo within virtual reality.
segmented models work beautifully, but DICOMS sputter and black out.

system: HTC VIVE
video card GeForce GTX 1070ti
RAM 16

GTX 1070ti should work for average-sized volumes. Follow these instructions for optimizing performance and choose the right balance between quality/speed: