Elverias

These dumps are created at %SystemRoot%Minidump.dmp (C:\Window\Minidump.dump if 😄 is the system drive)

If you remove that, and just use a SSD for the OS, what happens?

I've done a few things at a time ..

I did another clean install but removed every other drive. I haven't installed the drivers by myself but let it done within a windows update. Plugged in the hard drive to get my backups and to use the storage. Since my 250GB SSD was on 88% through CrystalDiskInfo and was on 1°c i left it removed and i think this causes the stutter because i'd not a single stutter since then. Before: every 1-3 hours a stutter for 2-5sec.I still don't know how this could happen because there was just a few games installed which i haven't played but everything seems to work now as intended.

Thank you for your help

Yes, they are only there if you get a BSoD. But changing video cards shouldn't cause that...

Which version?

Can you post the BSoD minidumps here? I can analyze them and see if I can find a problem that might help us fix this

I got the AOC CU34G2X a little over two weeks ago.
The monitor is really good, it´s easy to install and setup, fairly easy menus and the G-sync works fully for me with no issues.
 
However, three days in i found a dead pixel, and the day after a stuck one in grey. AOC cannot replace this as far as i understood the emails, but the store i bought it in will let me return it for a full refund within 60 days.
 
Had these pixels not died, i would have kept it and felt very pleased. It´s very well allround, but of course, it´s no monster. It is however a very well balanced product for the price, since you get 144 hz, ultrawide and 1440.
 
I am no considering MABY to look at the G7 32" since my local store here in Sweden told me they received a new batch 2 weeks ago, and they should be working fine. However, i am also eyeing an LG Ultrawide as well, but that´s almost double the price of this AOC one.

your current config is fine. Although if want new fans here ya go.
200mm are high air flow low noise fans big down side is they offer almost zero static pressure( the ability to to push air through objects like a rad/heatsink/hdd cage/ect)
140mm and 120mm are the sweet spots. although picking fans can be a hassle unless you know what your looking for. Personal and i think many people would agree AF (air flow) fans are a waste. What you want are SP (Static Pressure) fans. They can move just as much air and are able to push the air through obstructions.
 
As i said at the beginning your current is fine. If you want to add a fan. I would add 1 fan to the top rear of the case.
 
If you want to over haul you and get new fans for your whole system.
 
2x 140mm or 3x 1200mm for the front( i'd go 140mm, it will move more than enough air and simply look better in that case, but 3 120mmx would move a little bit more air. also if you choose RGB fans it will like alot better with 140mm fans)
1x 120mm rear
1x 140mm top rear ( you don't want the top full of fans as it will pull fresh out of the case before it gets used by the system.)
 
fan recommendation
defiantly not those "up here" fans
 
Get
Arctic P12 PWM and/or P14 PWM. they are really great at SP and low noise at a low cost.

https://www.amazon.ca/upHere-P200RGB-Hydraulic-Bearing-200mm-Computer/dp/B07MC7T8KD/ref=mp_s_a_1_6?dchild=1&keywords=200mm+case+fan&qid=1599590553&sr=8-6
Two of these for the front 
 
https://www.amazon.ca/uphere-3-Pack-Computer-Cooling-SR12-BW4-3/dp/B087BLQZNB/ref=mp_s_a_1_4?dchild=1&keywords=upHere+pwm&qid=1599590709&sr=8-4
3-pack for the rear/top as exhaust 
 
Could do 2 sets of the 3-pack for triple front, single rear and dual top as well but rgb front always looks cool

The RM is the newest and I am guessing the more budget option.. Don't know all that much about that one.
 
The RMX is just all around EXCELLENT.
 
The HX is Multi Rail.
 
If you feel you don't need the link feature then just don't get the (i).
 
The only thing I really see wrong with the new Focus is they are noisy with that 120mm fan compared to the RMX and HX with the 135mm fans that are also PWM.
 
So in order from least to best of what we are talking about would be RM, RMX and HX.
 
I have the HX 850W is my system currently.

That's fine...
 
I would also look at others however like the Corsair HX 850, RMX 850 etc when you are ready to buy.
 
Would be quieter..

I'm planning to buy the Seasonic Focus Plus Platinum - 850W. High quality, low price.

750W is fine as long as it's a good unit.
 
If you plan on keeping it for awhile through a number of upgrades and or builds there is nothing wrong with going with an 850W PSU.
 
There really is no overkill unless it's not reasonable such as getting a 1600W PSU for a 200W system as an example.
 
As long as it's reasonable it's fine.
 
Nothing wrong with planning ahead.

Plan/budget for an 850W unit & wait for reviews for better draw requirements... if 750W is a better value alternative, then you'll have saved a few €.