Cities Skylines on 12 Core Xeon E5 processor. How many cores is optimal?

This is a Machinist x99 x99-rs9 with Xeon E5, E5-2650 v4.
I recommend E5 v3 processors after my experience.
I bought the motherboard, cooler, cpu and ram cheaply from Aliexpress.

I recommend buying form the Machinist Official Store:
https://www.aliexpress.com/store/5789538

I recommend buying a Kit Set.
Kit Set will come with CPU RAM and Motherboard.

You will also need to buy a cooler:
Snowman Official store:
https://www.aliexpress.com/store/5361263
Buy a 4 pipe or 6 pipe cooler.
Buy a tube, plunger pack, of thermal paste (you need this).

Choose a budget E5 2620 v3
Or better a 2630, 3640 to 2550.
You can get 6 cores, 8 cores, 10 cores or 12 cores. It needs to be v3, I think this will be better than v4.
8 or 10 cores is probably a good number.

CPU feature comparison:
https://www.cpubenchmark.net/singleCompare.php
https://www.cpubenchmark.net/compare/Intel-Xeon-E5-2640-v3-vs-Intel-Xeon-E5-2650-v3-vs-Intel-Xeon-E5-2630-v3-vs-Intel-Xeon-E5-2670-v3-vs-Intel-Xeon-E5-2650-v4/2365vs2344vs2386vs2337vs2797

0:00 Intro
5:45 Core affinity.
7:00 Disable hyper threading.
9:45 CPU loading.
11:00 Disable two cores 10/12
12:00 4 cores disabled 8/12
13:30 6 cores disabled 6/12
14:10 What does this mean?
15:25 That's six cores.
16:20 Change to 4 cores.
17:00 Any conclusion?
18:55 Low frame rate on 4 cores
20:15 Optimal with 6 cores then.
20:50 Choose a E5 v3 processor then?
22:30 Fewer cores, higher clock speed then.

Afterword: this CPU is so powerful, it only needs about 35% to run the game, so it still works ok on 4 cores, it seems that the GPU would make the FPS higher.