It's almost upon us: after decades of efforts and dreams, consumer virtual reality won't be a thing of science fiction much longer. In just over a month both the Oculus Rift and HTC Vive will make their debut, and you'll need a pretty decent PC to power them—your graphics card being of particular importance. Both headset manufacturers are recommending an NVIDIA GTX 970 at minimum, and your time to upgrade before the big launch is fading fast. But what exactly will you get for your money if you decide to ...GPU Wars: GTX 970 vs 2x GTX 960 in SLI