Anyone running an AMD (formerly ATi) graphics card should check out this article: OBS VCE Download Page
OBS VCE is a special version of Open Broadcast Software which helps unlock the power of your graphics card for use when streaming.
Normal OBS just uses your CPU to process the stream, with OBS VCE the graphics card shares the burden giving a much more efficient, smoother streaming experience.
Check it out, there is a 32 and 64 bit version half way down the original post listed as a “Binary”. You will need a decompression tool such as WinRAR, 7Zip or Winzip to extract the files.