Hey guys, Done loads of searching over the Internet and on this forum and I can't find my answer exactly. I have a Mac Pro at work and I would like a 3rd and perhaps 4th monitor on it. System Profiler tells me I have an ATI Radeon HD 2600. I tried a random PNY (cheap) PCI-E graphics card, booted the Mac Pro up and it detected it, but no output to the monitor. I assume Mac Pro's need specific graphics cards, ie like the one I already have? Is the best/cheapest way of doing this just a simple case of buying the exact same card? Thanks in advance, cheers.