>>312010114
The difference may look small but it's a matter of scale and some factors to consider. Firstly, the CPU is just about always your bottleneck for VR if you have any decent GPU, and consider that every instruction your GPU gets comes from your CPU first, so it's much more important to keep that running smoothly. CPU bottlenecks feel much worse than GPU ones. 

The difference looks small because it's in frame times, but let me convert it for you. 11 milliseconds is the longest time you can possibly take to render at 90Hz successfully. With SMT on, you can see peaks to as high as 16ms, which is all the way down to 60fps. Your FPS in terms of these graphs, is always the highest value for any given frame. If your CPU takes 16ms to render a frame, and your GPU takes 5ms, then your output will still take 16ms in the end. (It's a little more complex than that since they can run somewhat in parallel, but that's the gist of it.)

Intel's version is called Hyperthreading. Should be a simple toggle in your BIOS. I can't say how much of a difference it makes on Intel, but it should be roughly the same.