lowredfred

The higher-end boards do that.
Usually, the VRM should shut down at 105°C, buildzoid's Prime B350 Plus did run 117°C benchmarking, here is Strix B350-F at 120°C from OCN

Cooler Master V550 or SeaSonic G 650/EVGA GQ (these are on sale I think, only buy if they are below 70)

An average Joe wont have an idea what is going on (most likely even raise the voltage) and still, these mobos won't do anything.
Prime B350 Plus (same stuff as you recommended but with heatsinks) did happily work at 117°C, well over 105°C for the caps.
Strix B350-F did happily work at 123°C, well over 105°C.

i have decided on the edited build from DocSwag due to the fact that it's Gud and room to upgrade in the future whilst staying under budget
 
thank you all very much for all the opinions and suggestions
i always learn so much when i create a form post

I don't have a problem with 8 cores and water cooling. The problem I have is you are pairing this with a very cheap motherboard.
On the prime Plus, which does have heatsinks, an OCed 8 core had the mosfets reaching over 115C.
 
This board doesn't have heatsinks. I'm pretty sure it doesn't have working temperature protection. It's gonna reach over 125c which is gonna make the caps suffer, without doubt. Within 1-1.5 years you'll probably have a dead mobo.
No, it doesn't. If you needed vrm temps you need a temp sensor on the vrms.

wrong
The VRM of that type can get up to 75°C with overclocked R5 1600 (~80A, R7 at stock is close to that) with heatsink. It will go well over 80°C with no heatsink, more like 90°C and the moment you touch any OC settings, the VRM will hit over 100°C. Capacitors will die within a year or 1.5yrs

My recommendation is simply don't cheap out on the mobo.
 
If you put an 8 core with a water cooler on a 4 phase vrm without vrm heatsinks that's just asking for your mobo to be dead in a year.
 
I don't have any problem with you giving recommendations, it's just that when somebody gives a recommendation that, in my opinion, is not a great one, I feel the need to point out the flaw in order to a) prevent the person we're trying to help from taking that recommendation and b) in order to help other people learn and potentially give better and more useful recommendations in the future.

In that case I would suggest you get a 1700. With the stock cooler you should be able to hit 3.6-3.7 ghz ish. If you want to push it higher to around 3.8-3.9 you could look into something like the H5 or Dark rock 3

PCPartPicker part list / Price breakdown by merchant
CPU: AMD - Ryzen 7 1700 3.0GHz 8-Core Processor  ($379.50 @ Vuugo) 
Motherboard: Asus - PRIME X370-PRO ATX AM4 Motherboard  ($189.00 @ Vuugo) 
Memory: Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory  ($219.99 @ Amazon Canada) 
Storage: Crucial - MX300 275GB M.2-2280 Solid State Drive  ($109.99 @ Amazon Canada) 
Storage: Seagate - Barracuda 2TB 3.5" 7200RPM Internal Hard Drive  ($78.50 @ Vuugo) 
Video Card: Gigabyte - GeForce GTX 1080 8GB WINDFORCE OC 8G Video Card  ($654.99 @ Amazon Canada) 
Case: Phanteks - ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case  ($99.99 @ Newegg Canada) 
Power Supply: SeaSonic - FOCUS Plus Gold 550W 80+ Gold Certified Fully-Modular ATX Power Supply  ($94.99 @ Newegg Canada) 
Wireless Network Adapter: Gigabyte - GC-WB867D-I PCI-Express x1 802.11a/b/g/n/ac Wi-Fi Adapter  ($44.68 @ Amazon Canada) 
Case Fan: Corsair - HD120 RGB 3-Pack w/Controller 54.4 CFM  120mm Fans  ($94.99 @ Amazon Canada) 
Total: $1966.62
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-11-14 09:01 EST-0500
 
I changed around a lot of stuff and squeezed quite a bit of extra performance out of it.

https://ca.pcpartpicker.com/list/3GtKYr
 
You can make the 1700 into the 1700x  for less by OCing. If you do not want to OC then forget this.
 
I left the 6 RGB fans because you can swap out the ones for the radiator and the rear fan.
 
120GB SSD just is not sufficient so i put a bigger capacity one.
 
changed the case but it still is RGB because you seem to be spell bound by it.
 
 
 
 
 
 
 

And we like to use actual facts

B350 is junk and for R7 with AIO you need a decent VRM.

Specific reason why getting it is a bad idea is the fact it has insufficient VRM for R7