panathas :
I think it's best to leave the CPU at its default frequencies and not overclock without at least getting a better CPU cooler than the default one. I don't know what CPU power saving settings your BIOS might have but one thing is for sure, when you are overclocking those power saving mechanisms and the CPU downclocking go out of the window. You can search your BIOS for various CPU & power settings but you shouldn't overclock your CPU in order to take advantage of them. Windows power saving mechanisms don't have any effect on overclocked CPUs that have a locked frequency. Finally I don't think that a damaged IHS may cause this but you can't be absolutely certain, so I think it's worth looking into this. If you can, post a pic here showing the damage.
Since the crash happened again while just watching youtube, I don't think its the PSU. From what I can tell you should try 2 things.
1)Try to update the motherboard BIOS, if you haven't already done that.
2)Don't overclock your CPU, leave at its default frequencies.
3)Monitor the GPU more closely (voltage, power, temps, fans etc.)
The damaged IHS might not directly cause the hard locks but if the exterior is damaged theres nothing stopped in the internals from being damaged. it's very small damage but depending if it the issue happens again I may try exchanging it. Since it's the only part I know has some issue. And my psu isn't the main suspect anymore. I really hope it's not the gpu.
1) I am updated to the latest version, 1103 https://www.asus.com/ca-en/Motherboards/ROG-STRIX-B450-F-GAMING/HelpDesk_BIOS/
2) I did re-disable boost. Temps were pretty high at idle so I turned it off and remounted the cooler again.
3) What am I looking for? My GPU sits arond 35-40c idle, 0-5% load, 1569mhz, ~700rpm, power consumption is 24% TDP, VDDC is .8, mem clock is 1377. I'll run a stress test in a bit and post those values.
https://drive.google.com/file/d/1TUgqg3qWTEmFv586mXa3beDz0N6la8GE/view?usp=sharing it's a little hard to see but theres what looks to be a scratch and a small chip in the IHS.
EDIT: I really have no clue. I ran a stress test (heaven benchmark) it ran perfectly fine for a while. staying ~58c stable. I started doing stuff, fiddling with other fans w/e and it happened. Then I booted back up, went right back into heaven and rand for 10-20 minutes again stable and fine. I hit 61 but that was probably due to messing with other fans. My cpu got up to 71c with only 10-20% load. Think my case fans just suck which is part of the reason for some of my heating issues. I think they both max out at 1300rpm and they never hit that. I can barely feel any air flow. but anyway. I still can't tell what the issue is. It could be the cpu over heating, it could be a gpu issue, it may be a PSU issue but if the seasonic issue only occurs under load I guess it probably isn't that. I'd much rather spend $140+ on a psu then how ever much on a new gpu. I'm gonna try newegg and see what they have to say. I may contact Asus to see about my gpu's warranty. I really don't know. I live in a small city so I couldn't even ask random people to let me test with stuff. There's no second hand market near me aside from the random overpriced full build.
Here are some SS's of the gpu info
https://gyazo.com/04be91bce70f4fdcd5c384b76f3017b4
https://gyazo.com/13c2d7937ba02d1e4182a722249edfa9
EDIT2: the before and after crash were slightly different, I didn't have all the same programs running, idk how much that would effect it and if that would point the issue toward a different piece of hardware but I may try again later with chrome and other stuff opened.
EDIT3: Just ran furmark for 20 minutes and no issue, other then my pc turning into an oven due to bad air flow and shit fans.
Here is after ~17 minutes of running with both side panels and the front panel on
https://gyazo.com/20c3db3b2d4f54cb153542fd7029a53c
This is right after I removed my side panel
https://gyazo.com/60e3c1ca6e5d4dc99c81cccb9f94db83
Does this mean I can be pretty sure it's not my gpu or would I need to run a less intensive test for longer to know for sure. I just really don't want it to be my gpu as I'm not sure it's under warranty and it's the most expensive piece. Like I said I'd much rather get a more expensive PSU, and even pay a ree stock fee then have to buy a new gpu, and I would obviously much rather rma or exchange something then have to buy something(aside from a case which I plan on purchasing soon)