Dac or Power regen, which gets the better cable?

Although I’m guilty of not following the recommendation, it’s been suggested that the source first in terms of PC’s, then preamp > amps, > power regenerator (or similar) afterwards. 

As I say, I’m guilty of reversing this. Just installed new PC’s on my preamp and amps, now need to get new/better for the DAC and the CD transport. SOTA TT has its own power supply. What got better I’m sure will get even more so when the sources PC’s are replaced.

@bkeske 

I thought about going to the streamer but I’m thinking the Dac would benefit more from a higher grade PC since it has a giant power supply (Denafrips Terminator).

@jl1ny 

I would agree with that. I have an Aries II, and that will be my next piece to get an updated PC.

DAC

I've seen a video with Paul from PS Audio where he mentions that the need for fancy power cords with their power regenerators is theoretically unnecessary even though they use very fancy ones.  If they do what they are advertised to do then they should produce essentially perfect power and require nothing in front of them.

In my very limited experience with cables, they don't always make an audible difference which may be a limitation with my system.  In my case I heard a very clear difference with a different PC on my Pathos Classic One MkIII, but cannot really say that I've heard any difference with different PCs on my DAC (two different ones).

From a purely theoretical perspective I think it makes the most sense to use a good PC on the source where the signal is the smallest and any noise or distortion will be amplified at each successive step (i.e. preamp and power amp).

Some PCs are specifically designed with source components or amplifiers in mind.