Hello Richard, I need help with cat m329, I'm using 2 machines 12-core MacPro 2.66 ghz, 12 gb memory ,video card quadro 4000 for 6 out DVI at 1280x1024, one triple head DisplayPort, one triple head dvi classic., phoenix sdi, 2 disc OCZ for raid content Snow leopard 10.6.6.Whit catalyst open the triple head DP releases the video signal(black screen whit no video input ), the triple head dvi it's ok, with catalyst closed ,stable and ok, which may be the problem .triple head DP are not integrated in m329 ?? Operating system at 32 bit, capture video ok, sorry for my english: