OK, first thing to say is that I have read a lot of threads on this topic already, but I know almost nothing about graphics cards and I'm having real problems using the information I've found to inform my choice. Please treat me like a complete novice. The situation is that I have a Mac Pro early 2009 (4,1), which I use for music production. It has the stock GT120 graphics card, and although I know it's a very weak card, until now I've never been interested in changing it, as I have only ever been interested in the sounds that emerge from my machine, not the graphics. Until now, I have had no interest in gaming on my Mac, but I HAVE to play Elite Dangerous, as I started playing Elite on the BBC Model B in 1984 and also enjoyed the sequels. They're the only games I've really been interested in. My Mac Pro seems like a reasonable machine for playing Elite Dangerous, except for the graphics card (I have a separate internal HD with a Windows 7 installation). Just to be clear, I have very little money to spend and I would be quite content to play the game on minimum settings as long as I can have a reasonable experience, I just don't want the game to pass me by. This is what I think I understand about choosing a graphics card: since Lion came out, it hasn't been necessary to opt for a Mac specific card, as long as you don't mind losing the EFI boot menu and Apple boot screen, although some cards can be flashed to provide EFI support. I can live without the boot menu though if I could find a card that could be flashed, that would be great. Now here's where I'm struggling: I've heard that an Nvidia GTX 750 card is a good choice for Mac. Does it matter what brand I choose? Can any brand be flashed? Is it correct that 300W is the maximum power consumption acceptable (I have no other PCIe cards installed)? Is there anything else I need to think about? Now for a specific example: could I choose something like this? I am not sure about the power spec. The specs says it needs a 400W power supply. Does that mean it actually consumes 400W or does it just mean that the computer's overall power supply must be rated over 400W? Presumably if it's the latter, a card like this should be OK? Thanks in advance for your help. As I said, please treat me like a complete dunce.