Worked right out of the box in the first Mac Pro, July 15, 2009
I have the first Mac Pro Model 1,1, Woodcrest. There are limited high performance graphics cards available. I purchased this upgrade kit from Apple, and after getting the right adapter for the Mini Display port for a second monitor, installed it and it works great. Understand that this is not listed as a supported computer in the Apple documentation. I have only had it a short time, but it works great.