Hi, I have a MacPro here with a 4870x2 connected, (using Apple's mini onboard PCIe 12v rails to supply power) in slot 2. (1x 24" Dell connected via DVI) OEM 2600 is in the 1st/bottom slot. (2 x 24" Dells connected via DVI) I Decided to upgrade from Leopard to Snow Leopard, but am having a hell of a time getting the 4870x2 up and running. (PC side is obviously fine) A couple of questions... First of all... anyone got the 1-core driver active and happening so far? because I just assumed that it would be, considering it worked in Leopard. Secondly, do I use the same instructions/howto that's for hackintosh's over at this forum? I have tried the above, (both the "accel" download and the updated instructions/downloads to no avail) At the moment, a vanilla install knows the card is there, as the "Arrangement" tab in the Displays System Preferences is coming up with 3 displays connected at 1920x1200, but the Dell screen connected to the 4870x2 is black. (orange standby light on) After applying the updated instructions from the above link, I get a corrupted array of horizontal pixels just after the grey Apple logo on my 2600HD connected Dell screen. Other 2 displays are black during this and the whole machine is locked up... (not KP'd but screen sharing is not available either) If someone has got this happening, could you please carefully outline your procedure step by step and also include links to files you used to get this card happening in 10.6. Cheers, R.