You didn’t use any of the power cables from the Corsair 850W PSU when you swapped in the ASUS 750W, right?
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Oof, great point. And honestly, it’s rare for a PSU to go bad and replacing one with a weaker option doesn’t make a lot of sense unless the original was just extreme overkill. Depending on the other component specs, it could still be a PSU problem. If 850W isn’t cutting it, 750W surely wouldn’t. I also noticed this:
I’m not as familiar with DOCP since that is Asus specific, so I tried a little research. I found at least one claim from Corsair that it maxes out at 3200, and another on Reddit that some motherboards would max out at that but may also be able to do better with a BIOS update. You later said you tested the RAM and it was ok, but you didn’t say anything about how you tested it or at what speeds it became stable.
If the mobo is only good for 3200 and you have tried to push it to the advertised 3600 on your RAM, or have incompatible timings, that’s another potential avenue to explore.
So please give us the full system specs because these ideas are all shots in the dark right now.
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I recently had PC shutting down (BSOD) turned out to be an MSFS addon which surprised me, only explanation i could think of it was causing the Graphics Card to crash. So cause is not always Hardware
yes scum which nails the gpou like MSFS does not shut down the pc
at 2666 its stable at others it wont boot, it used to run at 3600
If your computer completely powers off entirely without notice at heavy load, that pretty much is the powersupply protecting itself against being asked more wattage on a rail than it can deliver (an overload).
If you CAN turn on your computer again after a few seconds that would confirm it. Lower wattage PSU’s usually allow less amps/wattage on a certain rail.
A certain certificate (like bronze, platinum) only has to do with it’s efficiency rating. Not if it can actually provide the needed amps 
Check the PSU’s specifications. Most brands have a table available showing how much Amps are allowed on the 12V rail. While at it, do check on the EPS version of your motherboard and confirm the PSU has at least version too.
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What are your pc specs? What CPU? What GPU?
The PC shutting down isn’t related to MSFS, it is usually hardware related. The fact it turns off while using MSFS just means the sim is probably using more of your system than the other softwares/games you use.
It’s important to know your PC specs.
so I fresh installed Windows 11 and FS2020, old PSU and its JUSt done 9 hours without a hitch, so it wasnt HW related, the GPU was using 120 watts with the new install as opposed to 260 the old install
Unfortunately this still doesn’t really answer the question of what the root cause was, and your GPU wattage now being cut by over half probably means you have left performance on the table or have another issue going on artificially limiting it. If you are happy with this result, then so be it.
I really doubt you fixed it. Like Mooncatt said above, you probably just have a capped GPU. It’s costing you performance.
Also, you didn’t say your specs. It’s important to know.
yes it fixed, I know why its limited performance, but I can get more out but i wanna test before, also yes it does answer the question, MUST have been something I had before, 14 hours non stop not an issue
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So you went back to the Corsair 850W PSU, and your problem was solved?
So … you went back to the old PSU and say it has been okay for 9 hours ‘so it wasn’t HW related’.
Bit confused here. Isn’t a PSU hardware?
There is a reason why a lot of us here are keeping on asking you for your PC specs 
I hope it is sorted for you anyway. Like @Cahzito said above though, I wouldn’t be too sure.
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Something isn’t adding up. You claim it’s fixed, but say you aren’t sure it’s fixed. Otherwise why keep testing?
Combine that with your continued evasion of key questions about system specs make me wonder how legit this whole issue is. Sometimes a fresh Windows install is needed but is extremely rare and only as last resort after ruling out everything else. You replaced one part, refused to do any troubleshooting, and jumped right to the nuclear option OS reinstall. What lead you to the conclusion of that being necessary? Not to mention it introduced a new problem with the low GPU utilization, which may actually be masking the original problem rather than it being solved by the OS reinstall.
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OP has started one topic (this one) and has one (very negative) post in another.
And that’s all.
Nothing wrong with being a ‘less active’ member.
But the lack of response to our attempts to help is weird, to say the least.
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If your GPU power consumption dropped to just 120W, it seems like something isn’t quite right or perhaps there are details you haven’t shared with us. You also haven’t provided the full specs of your PC and information about background programs running. It feels a bit like reading through this thread is a waste of time. I hope you manage to solve the issue and get back to flying virtually without any problems.
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Issue resolved by OP.