Yeah I figured 700 is enough. Luckily I’ve come across several used ones... Wich may likely be the problem. The first one I bought was brand new and 450 watt, so I’ll take that as “it was too underpowered” the second one looked like it came out of a stock system. It was a 650 watt. Then I took it to a pc shop, the guy cleaned it up for me and I discussed my issue and he carefully examined my motherboard and told me it was fine(I believe I’ve examined it pretty close myself) and then he mentioned it could be overheating, then gave me a used 700watt unit Wich was slightly damaged on the outside. I took it apart and bent everything back into place, put it back and installed into my case, started up great no issues for 2 weeks. Was producing music for 3 straight hours then it died. But I simply don’t think it’s overheating. No I wasn’t looking at the temp when it shutdown last, but I’m sure it couldn’t have been above 80. So I’m still unsure and starting to worry about my motherboard... or I’m simply missing something simple like cheaping out on a psu. I’m at a loss..

Overheating, A short in the system wiring or one of the components? I would carefully examine every inch of the system and check for any possible points where it could short. A PSU of 700W is more than enough to power that system. However are you using genuine Dell PSUs or a name brand PSU? Any quality name brand PSU will have at the least a 5 year warranty. If you buy 80+ (and you should consider nothing else) they always have a good warranty and are reliable. There are a lot of 3rd party PSUs that are simply not worth the cost.

To be quite honest of all the budget components you can buy for a system, the PSU is not one of them. That is the heart of the system and you should always buy new and quality. EVGA, Corsair, Seasonic, just to mention a few. And always as I stated 80+. With new if something goes wrong you have a warranty of at least 5 years and in many cases of 10 years.

This is the most recent one that went out, also I should mention I have yet to have paid for any of the psus except for 1 so far. So I got lucky there I guess. I was given this one by the pc shop guy.      The 450 watt one I had originally was evga brand but like I said I’ll take that as “insufficient wattage.”

So i took it to the pc repair shop again. He said at this point it’s gotta be the wiring in my house...

how do I test this? I have a multimeter and little knowledge on wiring lmaoo. I’m not ignorant though

If want to test your house wiring, use a simple tester with lights that plugs into the outlet.  https://www.amazon.com/s?k=outlet+tester&ref=nb_sb_noss 

Optiplex 9010 Tech Guide 

The standard 275w PSU in a 9010 MT is enough to power a 75w GPU card.  Going through that many PSU's is no coincidence.  Either an internal or external short would do it.  Is the power cord still in good condition?

I'm going to second or third that a better brand name other than Gamemax be used for a PSU like EVGA, Corsair, etc.  Definitely don't want to just go cheap.

As for the EVGA 450w PSU you tried, it's entirely possible one or more rails had insufficient wattage.  In reviewing your first post, I was reminded that you're running 32GB RAM.

I also suspect the evga 450 watt psu was defective brand new... it had always made a Loudish ring or whine.