If your screenshot is showing an accurate clockspeed for your card, your GPU manufacturer has what I can only describe as an “Optimistic” overclock on that card. Boost clock on the 1660 Super is only 1785 MHz and you’re at 2100 MHz. Can you try turning on debug mode and see if the reboots stop? To do that, right click your desktop to bring up Nvidia Control panel, then click the “Help” tab and turn on “Debug mode.” If that fixes things, it means your GPU comes with an unstable stock overclock and they should replace it for you. If you put that overclock on the card, you should disable it to prevent voiding your warranty.
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Thank you for the suggestion. 
I’ve gone ahead and turned on Debug Mode, we’ll see if that helps. I genuinely hope so.
As far as overclocking goes, as far as I know I haven’t done anything like that on here. I’m not 100% on what that is exactly, but I’m just looking to go with something functional, not trying to create a hyper-gaming machine. That will come later when I’m employed, one of these days.
That…didn’t work. 
Just restarted 3 times in the span of 10 minutes, trying to kill a rare mob in EQ no less.
Anything else I can try?
You could try an app called Bluescreen view to see if it can tell you why the shutdowns are happening. At this point, it just sounds like your GPU or another component is failing.
When you looked at the Windows Event Viewer, there were no errors before the one for the shutdown?
This is all I’m getting when I pop open the Event Viewer after a shutdown. If there’s anything else I should look for though I’m not sure.
I’ll take a look at Bluescreen view though. Is it this link here?
I’ve shared my issues on another discord and learned a couple of things.
My 1660 Super requires a 450 wattage power supply. The power supply I have is 600.
Should be enough, right?
Also looked at the DxDiag and the notes say “No problems found.”
I swear, all of this searching for the mysterious cause of my issues…this is like an episode of House, lol.
Yes. Your power supply is providing more power than is needed.
I feel bad for you, I’ve been lurking your thread and thinking about how I might help.
All of the advice so far has been sound, but in my experience, if the computer is just flat out restarting without any error or blue screen … you may have an electrical issue, assuming you’ve eliminated dust/dirt and/or heat as the culprit. Not a power supply issue, per se, but a wiring issue.
Set up a good light source and check all the wires inside of your case. Make sure none are accidentally caught in screws, especially case screws. Make sure all your connectors are tight. Run your fingers down all the wires and check for bare spots where some of the insulation might have worn down.
This includes your power cord from the wall to the power supply. Is it fitting snug? Does it have any cracks or wear?
If something’s not grounded properly, it’ll cause an instant restart, for sure. This could be intermittent, as heat causes a screw or wire to expand ever so slightly.
Make absolutely sure the surfaces of your components are clean and have good clearance between each-other. Make sure there’s no metal-to-metal contact between components, or metal debris on the board(s).
OK, aside from that, you can easily identify (or eliminate) your video card as the culprit by removing it completely from your system (plug your monitor into your onboard video output) and seeing if your system restarts after playing. Graphics will suck bad during this test, as onboard video is weak, but you’ll still be able to play something for a while and see if you get a restart.
Another option would be to buy some cheap $10 card off Monoprice or Amazon or something and run that as a tester, watching for restarts.
Yet another troubleshooting option would be to completely remove all the components from the case, and run the system on an actual table instead (lay down a towel, and just lay out each part.) Again, this would eliminate ground issues from the case / lighting / case fans as a culprit.
Best of luck.
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Thank you for your detailed reply. 
I’ll take a look. I will be opening up the tower again soon and will be sure to look at that.
As far as I know, no issues there.
Others have suggested that it could be a video card issue, but I’m genuinely hoping that’s not the case. I threw away the box and it’s been a month and a half since I bought it, I’m genuinely dreading having to deal with returning it, if I even can.
I’ve had days where it doesn’t restart, and then days where it restarts 3 times. Would a video card issue be there if it was fine on some days?
A friend of mine thinks it might be a heating issue. I plan on getting a small fan to just have pointed at an exposed tower. Had another person joke about mice making nests in computers but I have a cat so no problem there. xD
That really depends on how much the rest of your hardware needs in addition to the 450 watts.
You can test that theory without buying anything. Run HWMonitor and see what your max temperatures are. I truly thought this had already been done, but I was pretty late joining in on this thread.
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It has and I think the benchmark program thingie had my temp at 77C. I’m not certain if that’s considered “restart” worthy though.
Same. If heat hasn’t been eliminated as the issue, I’d definitely start there. Vacuum out. Disassemble. Clean all the fans… clean them well, in detail, with a q-tip - or just replace them (fans are cheap). Get the fan that’s cooling your CPU, the fan that’s integrated into the power supply (this one can be tricky to clean - blow it out with some compressed air) and all the case fans. Normally I’d say the GPU fan(s) as well, but with a brand new video card, that’s not gonna be an issue.
Also visually inspect each fan to make sure it’s functional.
Then clean/wash all the vents on your case. Even with a clean or new fan, a dirty vent will impede airflow.
That’s the bulk of improving heat issues.
While definitely not the culprit, just for the future, routing cables cleanly can help airflow. If you don’t want to tape them up in nice little bundles, you can buy plastic cable sheaths for like a buck that will keep things nice and neat.
77C during a benchmark test isn’t bad, as your system is being stressed to the max during such a test. It’s not a great or excellent temp, but acceptable. Ideally you’d want this lower, but 77C would not cause a system to restart.
There are other temperature monitors though. Your CPU is monitored, your GPUs are monitored, the motherboard is monitored, and on some systems, even the internal case temperature is monitored. Any of these spiking past a “safety point” would cause a reboot or shutdown.