Dear all I am looking to buy the top end base model of 27 inch rimac. I am in dire need of your advice please. These are the specs I am looking to get: 3.5GHz Quad-core Intel Core i5 8GB RAM (May upgrade later on myself to 16GB) 1TB Fusion Drive AMD Radeon R9 M290X 2GB GDDR5 I don't do any gaming at all. I mainly use it for general purpose like internet, watching movies, MS Office and sometime I do encode a couple of home videos to another formats using handbrake, nothing major. The confusion I am facing is whether I should get M290X or M295X? How can i justify myself of spending extra for 295X card. A lot of people have share their experience about poor graphics performance on both of these cards but my question is whether the lag is due to Yosemite or the actual graphic cards? Since I am not going to be gaming will M290X will suffice me now and in future (2-3 years)? I am currently running 10.10.4 public beta on my late 2013 retina MBPro with 8GB ram and I have no lag whatsoever and very silent fans. Thus, those of you who have retina iMac, help me choose and also share your experience of running Yosemite 10.10.3 in terms of system performance.