STREAMER

Yes absolutely, especially on digital sources where controlling external emi noise is crucial. 

I was skeptical of pc impacts until I did a blind comparison with a group of both hobbyists and casual listeners.  Was comparing stock pc's to midrange Nordost (Frey 2, Heim 2) cables on Luxman M900U monos, Luxman C900U pre and Esoteric N-01XD streamer/DAC. 

Even the casual listeners noted better "clarity", especially with vocals and individual instruments, with the upgraded pc's.  I was frankly surprised by the repeatability of the results.  For my system the priority for improvement was pretty clearly the monos first, streamer and then pre.

As noted, my comparison was to the stock pc's, I still question the "linearity" claims by many of the cable makers but there is no doubt for my system that cables can have an impact.

Ultimately you need to do a comparison in your system to determine if the upgrade cost is justified for you.  One suggestion I would add, however, is to do the comparison with cables that represent a major step above your current cords.  Doesn't mean you have to go with those but will help you determine if pc's make a real difference.

Good luck...

One thing I did was using the same cable and replaced the connectors to Oyaide 004 and this made quite a difference on the DAC have done the same on the U2 but the male is Oyaide 004 and the IEC is Furutech FI28Gold am thinking of removing the Furutech and using the Oyaide 004 for the IEC let me see if that makes a difference hope it does

changing the connectors did make a difference 

Q: Why do the yes answers from long time uses outnumber one no?
A: Bingo.

Better PSU’s? Youbetcha.

These upgrades are just that @jasbirnandra as you reported from a better power cord. Utlra clean power via a PSU for lack of a better description adds blackness and that equals clarity.