Amazon.com: Quadro K5000 for Mac, 4GB GDDR5 PCI Express Gen 2 x16, DVI-I DL, DisplayPort, DirectX (Boot Camp), CUDA and OpenCL Profesional Board - Epic IT Service : Electronics
Amazon.com: Nvidia Quadro K5000 MAC 4GB GDDR5 PCIe 2.0 x16 Kepler GPU Graphics Processing Unit Video Card : Electronics
Latest OS X 10.8.3 Beta Adds NVIDIA Quadro K5000 Graphics Card Drivers - MacRumors