I just purchased a 40'' 4K TV to replace my external monitor, however my current MBP (Mid-2012, 2.9 Ghz Intel Core i7, 8GB Ram, Intel HD Graphics 4000) does not output to 4K -- which I knew when I purchased the TV. I figured I would upgrade my MBP when the rMBP's refresh later this year. However, I didn't think the quality from my current MBP would be so poor. There is noticeable lag (mouse/keyboard), ghosting, and the text is extremely blurry (or too sharp?). These may be artifacts of my TV rather than the MacBook. I purchased a LG 40UB8000 TV (http://www.lg.com/us/tvs/lg-40UB8000-led-tv). It has a refresh rate of 120Hz, which leads me to believe it is my MBP that is causing the poor performance. If my logic is correct, I now have to choose whether or not to upgrade. I don't have many tech nor apple fans, thus I am reaching out to this subreddit. Here are some of my questions Can I upgrade just the Thunderport from 1.1 to 1.2 permitting 4k output? How big of an upgrade is rumored for the rMBP line? My graduate school offers a $1000 reimbursement for "professional development" that can be applied to a computer purchase. Assuming I use this along with the resell value of my current MBP, should I upgrade now or wait?