Hello Adrian B,
thanks, but no, i am still on Snow Leopard so i am looking for a Radeon HD 5870 or HD 6870, and on second partition i have Mavericks, as Snow Leopard receives no more upgrades for Firefox (my main Browser) i am a bit dependent on newer OS; with Firefox Quantum i can also stream in HD, which is nice for Multimedia.
Yes, but i asked the seller, and it was showing System Info of Mac with 7950 and i clearly believe it was Snow Leopard, and he also confirmed ; i did not ask over his experience with the card, tough. I think the compatibility of ATI - AMD is probably better as it has a longer history with Apple i believe, but i couldnt say for sure.
As i am no Professional user, i would like to have a Graphics card that is fast, reliable and especially silent.
From what i read the GTX 980 offer all this, so maybe in the future i may upgrade, but for now i am holding dear to Snow Leopard as it allows also running Rosetta. If the Radeon HD 7950 would really be compatible with SL that would probably then be the best choice for now with a Dual-Setup with SL and Mavericks/Yosemite.