For people saying you need a massively high-powered rig to have Elite: Dangerous run smoothly with the Oculus Rift DK2.... it simply isn't true!
I'm on Windows 7, and have an i7-920 CPU, 6GB RAM, and a GTX 580. Nothing is overclocked.
I'm able to run E

at 75fps with no juddering and very, very few framedrops.
How?
By configuring the settings on your computer properly!!!
Here is what I did:
-Power on DK2, make sure it is in extended mode on Oculus Config util.
-Launch E

, go to graphics options, and set it to the Rift mode with 75Hz. Put all settings on LOW, with Antialiasing, Anisotropic, and Ambient Occlusion all off (you should only have to do this once, it will have the same settings every other time you launch the game).
-Right-click on desktop and go into the Nvidia Control Panel.
-Make sure DK2 is set at 1920x1080, 75Hz on the resolution settings.
-Go to Manage 3D settings, global tab. Set VSync to ON, Triple Buffering to ON, Set Antialiasing, Anisotropic, and Ambient Occlusion all to OFF.
-Go to Program Settings Tab, Browse to find elitedangerous.exe (The actual game exe, not the launcher exe). Set to the same settings as above.
-Go to Start -> Control Panel -> Personalization, and set the Windows theme to Basic (this is VERY important).
-Open task manager, and kill wscript and OVRService_x64
-Open the E

launcher, login, but do not hit "Play" yet. Place the E

launcher window on your screen so that if you were to view it on your DK2, it would be over the left eye.
-Right click on desktop background, and go to Screen Resolution
-Set Display to the DK2, and for the Desktop to only show on the DK2. Screen rotated to proper orientation on DK2. Place the "OK" button on the screen so that you will see it with your right eye on the DK2.
-Hit OK, your monitor will turn off. Look into the DK2 right eyepiece and move your mouse and click the "Keep settings" button before it times out.
-Look in left eyepiece, click on "Play" button on E

launcher
-After the logo plays, hit F12 to reset position.
-Get flying!!!
Note that I was getting some juddering with Windows in Aero mode, and with my main monitor still on and showing the desktop (even with DK2 as primary monitor). Changing those gave huge performance gains.
I would bet that with these settings, even someone with a GTX 480 or maybe lower can get buttery-smooth DK2 E

performance.
Also, running everything on low does not make the visuals look like crap in E

. With the still low-resolution of the DK2 and its screendoor effect, it is hard to tell the difference between high and low in the DK2.
People have probably posted settings settings similar to these already... I'm just confirming it does really help