sgtballs

Yes, you update the BIOS BEFORE putting in the new CPU.
Otherwise it wouldn't even boot.
ASrock says they don't recommend updating that BIOS unless you are getting the 5000 series or have the 3000 series. Whether or not you'll still be able to boot on the old CPU (2600), I don't know. But after updating the BIOS, simply power the PC down and swap the CPU.

Yes, looking at the latest BIOS for B450 Pro4, changelog says it adds support for Ryzen 5000, so yeah it should work after you update the BIOS.

I had the same issues when I first got my 5700xt.  I upgraded from Nvidia GTX970 and had the same problems you did.  I did 2 things at the same time and of them worked:  In setting / power settings, I changed to high performance mode and I did a DDU wipe and clean install of the latest drivers.  Since then I've had no black screen crashes.  I was also wishing I just got  2070 super but now I'm happy.  Hope you figure it out.  
 
PS.  Radeon Image Sharpening caused me some grainy texture issues.  Had to lower or turn off entirely to get a good image.    

If the game don't support multi gpu, then you can't use 2 gpu.
So it must have single card. check this out:
https://www.youtube.com/watch?v=6_ph1-sb2ok
 
On a single screen 2080ti can produce 70-90fps, so with 3 screen i guess it can get 30-40fps depending on the quality, playable but not perfect.
A titan have more VRAM, so it would definitely help running super high resolution.

you simply connect them via whatever ports are available one the primary card , hdmi or DP doesn't really matter.

Does the game you're using support multiple gpu's?

Check this out .....https://nvidia.custhelp.com/app/answers/detail/a_id/2667/related/1/session/L2F2LzEvdGltZS8xNTg2NTQ3OTMxL2dlbi8xNTg2NTQ3OTMxL3NpZC9mVXNJZkhYMzdwQ3FBXzA3SXZYS1RRN2ZoamdQeFBtX0xmMUJiaDRnV3dVRXElN0UyRGxBR0hJR2JMUkJzaXFMNEpDSUZzZyU3RTdTdnFWMGxaY2dZSXM1b3hMV1AxZUszRl9TeFpDMGYyVWhyN1pmOHpZUlR3Wms4NFBRJTIxJTIx 

RX 5700 or 2060 Super

do you have a 2600 or are you buying one?
RTX 2060 or 5700 would be the upper limit.

Thanks for the help, this build seems a bit more up my alley on costs and It seems that I don't have to really worry about potential updating the BIOs problems between the motherboard and the CPU

89*C / 90*C is quite high...
How is your overall case / system airflow?
What computer case / chassis do you have?
Does the temperatures drop significantly with the side panel of the computer case removed?
 
 
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Prebuilds can be just fine but you'll get more satisfaction and understanding of computers by building it yourself.  Start by watching some Youtube vids.  That should get the fire burning then start asking more specific questions.  Once you understand what everything does, then you can look at what are the best components for your needs and your budget.  Choose a budget, make a list of parts you think you want, then post them here for some feedback, then bulid the MF'er.  It's easier than you think.    
 
This will be fun  

Just adding latest pics of my build.

Also holy cr*p 16 cores for video rendering is insane!

Alright so I decided even if it's a bit late to do a bit of a build log on my main rig and the rig which preceeded it now I just got my 3950X, which getting actual hands on with, it is an absolutely insane chip without a doubt, the just sheer processing power and capability for muloti tasking at full load is blowing me away but what started it off?

Jumping to July of last year I was upgrading my other rig (see my profile/on the forum somewhere here for details) where the PC died, the GTX 1080 + i7 4790K I upgraded to overloaded the 350W PSU and killed the board and the PSU, meaning I was left with a very expensive paperweight with a lot of proprietry hardware that I didn't have the capability to modify back then, I was just gearing up to move onto maybe starting a youtube Channel and hell already had a 10TB NAS drive for mass storage mid shipping at the time and well....

In dire circumstances things happen rapidly.

I decided to get a very very very cheap Z97 ATX motherboard as it was compatible with everything I had and make a move to ATX meaning a new PSU, Case, etc....
 
For a while it sat as a frankenstein monster on my desk (pic 1) whilst I waited for other parts but she was modestly powerful 20GB of DDR3, 4790K, GTX 1080 plus a dedicated secondary card as a multi screen display adapter, but eventually my case arrived and well thats when stuff got crazy in the space between August (pic 2) on recieving the case to December (pic 3) it went through a TOTAL overhaul of its cooling from a hyper 212 and the included fans to Noctua IPPC 3000RPM fans across the case, a NH-D15 Chromx LTT edition kitted out with the faceplates and Red Accents.
It got new RAM now sporting 32GB of Hyper X Savage 1866MHz RAM manually OC'd to 2133MHz, which took a lot of trial and error but was perfect once I got the timings honed in plus the red matches the accents.
The dedicated secondary card got swapped from a GT 740 MSI OEM to a GT 1030 MSI Aero ITX and so far things were brilliant.


Then.....then January happened, from either delidding, overclocking or pure age the CPU began to die multiple BSODs regardless of settings, overclock, lack of overclock, it didn't matter the machine became unusable and soon enough would be dead in it's entirety in short February and March saw me working myself into the ground trying to get as many videos up on my own channel before the machine gave up and a race against the clock to secure funds for my planned upgrade in September of this year, in 2 months.

But it worked out through a lot of pain, working into the ground, selling my Xbox One X, doing work wherever I could and a very very generous loan from a very supportive friend I did it and on April 2nd, the last piece arrived, MY 3950X. (pic 4)

And that brings us up to now, where I am sitting on my fully revamped system, still got some stuff left to do, more parts to add, more stuff to overclock to the ragged edge and of course many memories to make on this chassis, but for now I bid Farewell and Present Dante's Inferno, for this story has often been a Divine Comedy.

Final Picture is as she sits currently

Current Specifications

Motherboard: ASRock X570 Taichi
CPU: AMD Ryzen 9 3950X
Cooler: Noctua NH-D15 Chromax
RAM: 64GB DDR4 3200MHz Corsair Vengeance LPX
Boot SSD: 1TB Sabrent Rocket PCIe Gen 4 NVMe SSD
GPU 1: MSI GTX 1080 Gaming X 8G (OC and on LM)
GPU 2: MSI GT 1030 Aero ITX
Game Storage: 2TB Western Digital Blue 2.5" 5400 RPM HDD
Mass Storage: 10 TB Western Digital Red 3.5" 5400 RPM HDD
PSU: Thermaltake Smart DPS G 700W Bronze
Case: NZXT H500
Fans: 3 * Noctua NF-A14 3000 RPM IPPC + 1 * Noctua NF-F12 3000 RPM IPPC

That and what you expect from your system, in terms of performance.
Let's say you want to spend 500 USD, but are expecting to play games at a 4K resolution at 144fps; that is not realistic. A system for that price would not be able to attain that level of performance.
 
At the same time, spending 3000 USD for a system to play Minesweeper (kind of unserious example, but just to get my point across), also does not make sense; as you can do that with much less.

If the 2060 is the same price as that 1070 you were planning on (or cheaper) then it would still be worth it over the 1660 ti because it is a better performer in games, even ignoring RTX.

I had crashes with black screens.  I had to change windows to high power mode to fix that.  The textures looked bad at first.  I was upgrading from Nvidia GTX 970 (I cleared with DDU) and it was noticeably worse.  I was disappointed.  Took a while to find the problem and on the advice of someone on this forum, I turned off Radeon image sharpening and that fixed it.  Apparently I'm not the only one who had that problem.  You are right, it's not that cards fault, its the software.  Makes me wonder what else I should tweek that I dont know about. 
 
I'm happy with it now but my experience was not optimal plug and play.     

PCPartPicker Part List
CPU: AMD Ryzen 5 2600 3.4 GHz 6-Core Processor  ($125.98 @ Newegg)
Motherboard: Gigabyte B450 AORUS ELITE ATX AM4 Motherboard  ($113.98 @ Newegg)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory  ($74.99 @ Best Buy)
Video Card: PowerColor Radeon RX 5700 XT 8 GB Video Card  ($383.98 @ Newegg)
Total: $698.93
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-04-05 06:05 EDT-0400
 
 
 
Entire PC and 5700-XT for almost the cost of a Super... LOL!

I had a problem with my 5700 XT but it was a RAM issue.  You said you re-seated the RAM but I had to do it several times until it posted.  If you've tried all configurations then its probably not that.
 
I did get black screens with the new card but I changed the windows setting to High Power mode and its not happened since. I don't know if that's your problem tho.  Good luck   

That's pointless and will only create issues. Sell the 1060 or give it to a friend and use the 2070S so as to avoid driver/software issues

My textures are fine... Radeon image sharpening is bad too by the way, use actual res changes if you want better image quality, 1440P or higher.
 
 
DOOM looks so razor sharp because i turned off all AA and just let 4K sort the AA, much better!
 

Have you checked the different settings in the Adrenaline software? Maybe it could be like Radeon Image sharpening?