What version of Photoshop CS6 has the 3D Workspace?

Only Photoshop CS6 Extended has that feature and it requires some beefy hardware to drive it.

Specifically at leasat 512MB of video RAM (vRAM) on your graphics card

http://blogs.adobe.com/crawlspace/2012/10/heads-up-photoshop-system-requirement-changes.ht ml

Also 3D will not be available if you're running Windows XP.