I have a late 2013 15" rMBP with the 750m graphics card. I've been using it attached to my Apple Thunderbolt Display and it has been running nice and cool. Recently, I upgraded to the new LG 34" Ultrawide display that runs at 3440x1440 resolution. I have it connected through Thunderbolt as well and now my MacBook runs noticeable hotter than before. I hear the fans pick up every now and then when working in Photoshop and Lightroom. I know I'm pushing more pixels than before, but I never dreamed that it would cause such an increase in heat. Is this something I should consider normal?