OK, longtime MR forums lurker here, but this is my first post (first time I've encountered a problem I just really can't figure out or fix myself, so now I need you!). Now that we've established that, this is my issue: I've been using my late 2012 MBA to output 4K to a Seiki 39" TV (SE39UY04) for several months using SwitchResX with no problems (other than having to run it at 15Hz). Since updating to Yosemite yesterday, I've been unable to get SRX to recognize any custom resolution at 4K. I've tried everything I can think of (e.g.; tried every pixel clock setting from 99MHz to ~200MHz; have tried various front porch, back porch, and sync width settings; etc.). I even tried running the pixel clock patch discussed here to no avail. 1080p is not a good option for me. I spend 10 - 12 hours at work each day editing multiple documents at a time (~10 at any given time, all while cross referencing each one for information needed in whatever primary doc I'm in), responding to emails, and doing lots of research. Going back to 1080p after running 4K will drastically reduce my productivity / efficiency. Has anyone else using SRX encountered this problem since the 10.10 update, and if so, has any solution to the aforementioned issue been found? I've searched through the forums pretty thoroughly, but haven't found the answer, so if anyone else has already brought this up in the forums, just link me to the thread. Also, (and this question might be more appropriate for the Mac Mini forum) will the base model Mac Mini (1.4GHz Dual-Core Intel Core i5 | 4GB 1600MHz LPDDR3 SDRAM | Intel HD Graphics 5000) natively support 4K output, or will I need to go up to the Intel Iris Graphics option? I don't mind just purchasing the Mac Mini as a dedicated office computer, but if I do, I want to minimize my cost as much as possible and be sure before buying that it will do what I need it to do. Any thoughts / suggestions are much appreciated!