I've been pretty lucky then....you see mine sounds like any slim iMac I ever heard (and I heard dozen of last gen iMac and surprising they all have same integrated speakers.) it's deadly silent and there is no yellow tint whatsoever, also bough first kit of crucial on amazon and works fine.
I'm not sure what are you talking about but your imaginary friend is not a geek...just a clown who copy paste tired comment from Facebook.
....best iMac I ever had were 2013 with 780m and this one, both post Steve Jobs era, while comments like yours are here since post powerpc era, 10 years ago' you would have said that since the iPhone Steve jobs don't care about Macs anymore...there is always a reason for crying out loud, so keep crying for nothing dude!
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The part is exactly the same...ask any authorised repair center...people just going silly for nothing...