I have a mac pro 3,1 (early '08) and I just put a saphire vapor-X hd 5870 in it (I have one from a PC that was never built). I put it in it to replace a dying geforce 2600XT. The card boots (no boot screen, but it suddenly pops up the login), but under system report it shows as a generic 5000 series. ATI Radeon HD 5000: Chipset Model: ATI Radeon HD 5000 Type: GPU Bus: PCIe Slot: Slot-1 PCIe Lane Width: x16 VRAM (Total): 1024 MB Vendor: ATI (0x1002) Device ID: 0x6898 Revision ID: 0x0000 Displays: VA2703 Series: Resolution: 1920 x 1080 @ 60 Hz Pixel Depth: 32-Bit Color (ARGB8888) Display Serial Number: SWQ130520379 Main Display: Yes Mirror: Off Online: Yes Rotation: Supported I searched all over the web, but the ntkas website is gone, and I can't find firmware for this card, to make it EFI. I'd like to get this card recognized, so I can use it's full GPU power. Any advice is GREATLY appreciated!