Ear Force X31 on PC

The X3's use an infrared laser, the X31's use 2.4GHz wireless. :)

I see I here I had thought it was infrared, but regardless of what the the x31's receiver has it causes interference on my wifi.

Well my computer uses an ethernet cable for internet. Would it effect others in the household?

Depends on the location of your computer, I know it is a small radius that it affects, if you have it in your bedroom it shouldn't cause a problem.