I hit Userbenchmark as well as look at what type RAM and what speed RAM is going into the build.
Since you already own the motherboard it's likely you already fitted the RAM. Also, the game title may or may not lean on the CPU as much. I find that an i5 is fine until the gamer talks about UHD 4K play.
I don't see the real speed choice here which is the SSD. Also the Seagate is known to be problematic. To check if yours is in that boat, read the 01 and 07 values of a Speccy report. If either are over 100 then you don't want this drive in any performance PC.
I am still building my PC, I would like to stream and game on it. I am curious though, what are the differences for the above processors mentioned in the subject title? And would it be okay to go with any of the i5 processors over the i7? Because the i5 is roughly $100 cheaper based off of what I've found, however, I don't want to sacrifice important performance perks based solely on price. Also, I'm staying away from Ryzen/AMD because this is my first build and I have found more information on Intel than I have found information on Ryzen/AMD, I may look into it on my next build, but for the purposes of this question and my build I am sticking with Intel for now. Thank you!
The rest of my build specs are (will be, as I'm still researching parts):
Case: NZXT S340 (Already Own)
GPU: MSI Duke GeForce GTX 1070Ti (Already own)
Motherboard: Asus Prime Z370-A (Already own)
Processor: (What this question is about)
Liquid Cooling: Corsair H100i v2 (Purchasing in the future)
Hard Drive: Seagate Barracuda 2TB 3.5" 7200RPM (Already own)
PSU: EVGA SuperNOVA G3 650 (Purchasing in the future)