Okay, I should remind everyone about the biggest pie slice in the infinite pie chart of options:
Fully proper isolating UPS power supplies are often pretty expensive. Good ones for data center racks can be well into four figures.
At a certain cost point, it's cheaper to just buy a giant LiFePo4 battery (e.g. cheap 12.8V 200AH with built-in BMS + get a cheap inverter) to battery-power your 500 watt gaming rig. And it usually fixes more external bad-electricity problems than even a good UPS will.
Basically build your dream UPS of clean electricity from scratch, and then unplug from your dirty power grid.
You can buy a large Jackery Power Station (or clone), many exist for between $1K-$3K all built. Or cobble together a 1000-3000 watt power station from scratch via YouTube videos. Google "how to build a lithium power station" if you can't afford a Jackery but can afford buiding your DIY power station $300-$600 kilowatt-hour-plus kilowatt-output-league lithium battery with built in battery management system (BMS) + charger + external high-quality inverter.
USD $279.99 battery + USD $59.99 inverter = Power Gaming Rig for 2-3 hours
You're your own power company for 2-3 hours, forget the dirty electricity stuff, forget wasting time troubleshooting...
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= USD $59.00
(12.8V 100aH = 12.8 x 100 = 1.28 kilowatt-hour capacity = can sustain 400 watts for 3 hours)
(now available for under $300 and can power an average RTX-powered desktop tower gaming PC rig for about 2.5 to 3 hours)
(120 volt 750 watt sinewave AC inverter not included -- but about $100-150 extra).
Search Term: "12 volt 100 ah lithium iron battery" on your amazon/ebay/favorite site
Okay, you need a battery charger too (I left that out), so you'll have to use a small charger overnight to refill your battery, but then you get 7000 recharge cycles in these new durable lithium-iron batteries. So 15 years of gaming offgrid 2-3 hours every night. These modern lithium iron batteries generally now have a built-in BMS system which makes it safe to attach an external voltage to these batteries -- much safer to charge these new lithium-iron batteries than an old car battery. Just use any old car battery charger, and call it a day.
So you see, for less than $400, you can power your gaming PC off a battery for about 2.5 to 3 hours, including your monitor and your Internet router (yes, you need to offgrid everything that touches the PC). Don't forget to isolate your Internet line too if you can, or preferably use fiber so no copper from outside world is touching your PC.
Add 50% cost in some countries, but these chinese kilowatt batteries are really cheap now -- absurdly so -- because of the EV adoption and grid scale batteries. The savings is now already passed to the consumer, so you can offgrid your PC for under $500!
Offgriding via a battery certainly won't solve adjacent interference (e.g. over-the-air interference from nearby large motors, like emitting from an old apartment mechanical floor or an apartment room adjacent to a laundry room of very old drying machines -- old motors can emit a lot of inteference, for example).
But it will solve dirty electric grid by becoming your own power company for your PC for under $1000.
The offgriding solution is one of the easiest and biggest brute fix-all slices in the infinite power chart of possible EMI problem+solution combos. It is now a money cost typically less than the cost of the gaming PC+GPU rig that you bought, thanks to the giant kilowatt lithium-battery price drops. If it doesn't fix your problem, at least you know your EMI problem is probably one of those tiny-sliver slices that is hard to find / hard to solve.
So if a battery (for your PC + router + monitor) doesn't fix your problems, then you've got bigger interference troubleshooting ahead of you.
