MacBook running much hotter with new monitor attached.

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i have late 2013 15" rmbp 750m graphics card. i've been using attached apple thunderbolt display , has been running nice , cool. recently, upgraded new lg 34" ultrawide display runs @ 3440x1440 resolution. have connected through thunderbolt , macbook runs noticeable hotter before. hear fans pick every , when working in photoshop , lightroom. know i'm pushing more pixels before, never dreamed cause such increase in heat.

should consider normal?
 

do have temperature monitor installed? wondering how of increase you're talking about.

although not use 2nd monitor intensive, use watch movie or tv shows (game of thrones:d) on samsung 46" tv , notice heating more normal. never been concerning on end
 


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