I have a 2009 (4,1) mac pro and would like to hear thoughts on what my best options would be to run dual video cards. Main use is illustration & design with PS, painter illustrator...etc... but i also dabble in photography and video work. Right now i have 3 displays (30" NEC, Cintiq 24HD and a cheap display to watch my slingbox), but as i delve more into video i can see myself getting another screen (which definitely means a 2nd video card) Currently i have a 5870 running in there. I have purchased a splitter cable to run a 5770 off the motherboards power cable if need be. This would be my guess as to the most powerful solution i can use (without the need to use unofficial PC cards) I also have access to the original GT120 that came in the machine, as well as a 8800 i can pull from a 2008 mac pro (will it even work in a 2009 mac pro?) The advantage of both these cards is they only take up 1 PCI-e slot. It's not a huge issue if i lose it as i just have ONE other esata card in the top slot, but i wouldn't mind having the option of adding another PCI-e card in the future if need be. Is there any performance hit by mixing ATI & nVidia cards? Also, from what i've read the risk of splitting the power cable on a video card is low, but ive also read a few horror stories. Is the performance worth the minimal risk, or should i stick with the gt120 and avoid that all together? Any other thoughts?