Hey, I am at a point now, where I just have to upgrade from my Apple Radeon 5770. I read myself into various cards, but still am quite clueless on which would be the optimal decision for my needs. I would like to use the card with the Unreal Engine 4 and Maya (+ some other game dev stuff) primarily. I am also producing music, though the GPU does not matter at this point. No problems with my 5770 at all. Bootcamp will be used as I will run all the game development stuff on there. As much as I'd like to run it on OS X, windows is just superior in these regards. Also, I would like to keep a GT120 in there just for the bootscreen. Are the 50W it eats up also part of the 225W limit? I am not sure since it's PCI powered. Would be very thankful if some one can enlighten me on that part once and for all. I am on a Mac Pro 4,1 (2,26 Octa Core) using Mountain Lion 10.8.5. Cards that I looked into: GTX 570 - I often read that this is the best card for computing tasks. Not sure if UE4 and Maya fall under that though. It has quite high TDP aswell. GTX 660 Ti - It just seems to be more on the weaker side nowadays already. Then again, I have no clue. GTX 670 - One of my closer choices. But again, is it powerful enough to handle UE4 properly? GTX 680 - My current top choice. Though I am not sure how things would work out with it + the GT120, as it would exceed the 225W limit. GTX 960/970/980 - These would be like the perfect solution. However, I am on Mountain Lion and cannot switch. (Music Production related). And even if I could, I wouldn't want to. It already was hard for me to switch from 10.6.8 to ML. And as far as I understand, these only work in Yosemite, right? So yea, these were the cards that made sense to me. I guess in the end it comes down to either the GTX 670 or the GTX 680 anyways. But I would love to hear your guys' opinions first. Thanks! PS: I forgot to mention: I do use some After Effects and Photoshop aswell from time to time, but I had no problems using these with my 5770 so far. So I guess this shouldn't really matter. I am going to keep the 5770 anyways, just in case!.