When I started I was using a Windows 10 clone PC based on a Intel Core™ i5-7400 4 core 4 thread for both the core and the bridge for my USB based DAC Bryston BDA-3. Used an Antec 280x case with led fans and water cooled cpu cooler.
I had an old clone desktop i7 3770k 4 core 8 thread based motherboard that has only two fast Sata ports. So installed an old 120gb ssd and 4tb datacenter drive in a smaller case (all parts I had around). Loaded Rock as soon as I did I lost a bit of sound quality maybe 5-7%. Suspected power right away (this tower is in a room away from main stereo don’t want vibrations affecting HDD) so started researching. Using reviews at Toms Hardware found computer power supplies where being tested for ripple (noise). Decided to purchase Corsair RM650x (550 sold out) which tests much lower than most computer power supplies for ripple (still nothing like an LNPS but costs much less too). Corsair had also built capacitors into power cables to prevent noise from feeding back from hard-drives, video cards, CPU, fans, cpu cooler, etc. The sound returned back to normal. I then purchased another RM650x for my Bridge and sound improved but this time much less as it replaced a newer power supply. I also added a 10 outlet power bar (no surge protection) to my Panamax Max5100 (purchased for triggering devices on and off) which helped sound quality at stereo system too (stopped using USB decrapifier). Ground removed from my Rega Turntable solving it’s ground hum as well. So that is not snake oil but the power bar had allowed everything at stereo to be plugged into power conditioner which is best practice.
So the take away I already had a Bryston BDA-3 DAC and a Bryston 3B SST2 connected to Paradigm Studio 100 v3 so could hear minor improvements. I would focus on those components first.
The i7 mobo has smart fan setup and massive after market cpu cooler. (was a gaming computer) even while indexing my 2900 album library the fan never spun up. When I turn on sample rate conversion to DSD 256 I hear fan spin just a little faster.
If you do go power supply route make absolutely sure that Dell is using a stock power supply that can be replaced with an after market one. 550w is plenty of power for what we do.
A power conditioner might be better first. As you can plug all components into it helping everything. Now I have crap power in my older neighborhood lights blink twice a day switching from one grid to another, everything I have electronic is plugged into at least a surge protector except my amp (has 15 years of warranty left Bryston does recommend plugging directly into mains).
Hope my experience helps.
Stay safe and enjoy the music.