Actually Mr. Pizza, that not true. Threads and cores are completely separate things. Threads refers to how many parallel computations may be done at a time, cores refers to how many execution cores are present on a chip.
One is software, the other hardware. You can't directly compare the two, it's apples to oranges, and stating Cores>threads is completely false. Threads are the the TASKS carried out BY cores.
It would be like saying I've a telemarketing company, and to make more money, it's more important to have more computers in the company, than having the software to make automated calls. It's nonsensical. You need both to get the customer, can't have one without the other.
If you mean having extra threads through hyperthreading is worse than having extra threads through cores, that's also not true. All threads by definition are virtual.
Anyway, for the OP's needs, the i7-9xx cpu's are better.
Agreed, more fans running at lower rotational speeds will help reduce noise generation.
Correct me if I'm wrong, but cases with a more enclosed design (no plastic window and less vents and grills) will help to dampen noise generated from inside the case from components such as the CPU, GPU, and power supply fans?
I guess it should be a fine balance between plastic parts and vents for airflow with the amount the case is enclosed?
but if you do go with one of the cheaper cases (which are quiet btw) I have a HAF922 and love it.....you might need an extra case fan on the side but grab any case fan and then run them at lower speeds....this thing runs soo cool it rocks.
but get a HAF 922 or 932 if you want and put the extra money into a better GPU like a 470 or a 5850