Hi Michael,

Yes indeed the 5870 is crap and old (wondering why apple still put these in macpro...)

We buyed a windows pc at work with a gtx680 with 4gb of ram (for heavy scenes in cinema 4d as well)

In our current macpro we can stick gtx560ti (use only 1 6pin connector) if osx is updated to 10.8.3 because Apple released drivers for gtx6XX cards in 10.8.3

I tried the displaythread thing, doesn't improve things much (tried with 1,4,8 and 12)

Will compare with the pc then maybe buy a gtx560ti :)

Thanks for your answers !