Multi-thread didn't last very long... :-/
Late last October/early November:
[link|http://z.iwethey.org/forums/render/content/show?contentid=61276|http://z.iwethey.org...w?contentid=61276]
[link|http://z.iwethey.org/forums/render/content/show?contentid=60143|http://z.iwethey.org...w?contentid=60143]
I silently reverted to the old driver + single thread mode in a fit of pique.