Oh God, how is that possible? One FHD monitor makes my 2.8 model whine already (despite I downvolted it and disabled Turboboost, so CPU isn't under a suspicion).
It's like we are speaking two completely different models. Interestingly, I've read many reviews about the same noisy and hot behaviour and quite a few about silent and relatively cool one. That's too weird.
Let's check our systems. I've got:
MacBookPro11,5, Intel Core i7 2.8
AMD Radeon R9 M370X, ROM: 113-C5670E-945, VBIOS: 113-C567A1-006, EFI: 01.00.945, gMux: 4.0.20 [3.2.8].
MacOS 10.13.6 (17G12034),
Boot ROM: 194.0.0.0.0
SMC: 2.30f2