Why would anyone buy a Z68 motherboard, and then use integrated graphics?
For example: Me
I purchased a ZOTAC H67ITX-C-E
(with i7-2600K) and use it especially for video editing.
It works fine and is very fast.
I have only the built-in HD3000 graphic unit
With LoiLoScope I get render times for MPEG2 and MP4 (720p or FullHD-h.264) of 20 - 30% real-time.
Next will be to dismiss my AMD-5050e-ATX und to replace it by an ASRock X68 Extreme 4 (also with i7-2600K).
There is also no extra graphic card needed...
Evolution goes on, you must only see this.
If you understand some German watch this video: http://www.youtube.com/watch?v=lTS0nokczuI