This temperature for a processor is normal, unless you're using a watercooler.
the noise can be coming from any fan, when gaming every component from the pc gets hotter and the fans speed up to cool them down, but gpu fans are indeed the loudest for the most part.
3700rpm is most likely the graphics card fan.
a ticking noise is never good, could just be a defective fan or even just a fan screw in too tight or too loose, i would suggest you to check your fans and use some program to check their speed to see if nothing is failing, that also can usually be checked in the BIOS.
after two weeks you've already replaced the whole computer? get you're money back while you can and ditch these generic builders for a better one, or build your own, it sounds like your in for years of pain and frustration
i know somebody that will sell you the "old" junk in the shop vs buying and assembling the newest stuff available. I also know somebody that has been a computer builder for years, that's right years. he still builds them the way they did back in 2002......... and people don't know any better because they are computer illiterate or are too cheap to invest into something worth buying. building is something everybody should learn, and delving into product like the pope reads the bible is almost a necessity.