TBH some level of fan noise is to be expected, unless you opt for a passively cooled system. PC OEM's just don't allow component's to get as hot a Apple does and for good reason. It's not the CPU that's likely to fail as Intel's limits are actually very conservative, it's more likely going to be a supporting component failing due to
thermal stress.
For myself I want two classes of notebook; desktop performance in a 15" - 17" format and a silent passively cooled 2in1 and that I have. The 2in1 only cost me $650 and it's perfectly fine for it's intended use (basic productivity) and it plays 4K with ease
There's also a level of variance with such items, by nature some CPU's run cooler than others, some can take deeper undervolt than others. Even my 17.3" GL703GS (8750H, 32GB, GTX 1070, duel drives) I want to run as cool & quiet as possible and it does within reason.
X1E & X1C are great notebooks, a colleague of mine has just bought a new high tier X1C and it's really nice, certainly not noisy by any means. Any notebook with a dGPU is going to have higher operating temperatures as it now has two major sources of generating significant heat, equally that can be controlled by the user.
That said with W10 temperature can be reduced and performance increased with a little patience. I use gaming notebooks similar to others professional's. They are extremely performant, have good cooling at fraction of the price of a Portable Workstation, with games being the very least of what I'll throw at them. I get cooling and performance as I'm very much stuck with portable solutions...
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