Not true, Mac OS 10.11-10.14 has drivers built in for Kelper cards which is why we're using them. And please STOP YELLING. Well I finally know you have a 6770m Since you never provided me details the last 6 posts, which means you have the shorter heatsink. While you were in there you probably should have upgraded your CPU to a 2600 non K. Boot camp on the 27"/780m in Windows will give you no backlight as stated by
@FlorisVN. And you should put k5 Pro on your VRam which is probably help with lagging in fortnite. Also you are running on a i5 2500 what do you expect.
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From IMG_3274 it appears you got thermal paste on your MXM contacts. Please clean that, and carefully check/clean your MXM slot.