Do I need upgraded power cables?

I use the Cable Co. a lot.

What has worked for me is to borrow usually four cables at one time. I do a fair amount of research to try to narrow choices down to near four.

Because they are already burned in, I don’t have to wait for each one to sound the way it will forever (and its best).

Then I try each one for 2-3 days, listening to very familiar recordings, and taking notes.  Lots of notes.

Then when I have to send them back, I try to pick my favorite.  Most often, one of them is outstanding and sounds exactly like what I had hoped.   Sometimes, none of them sound like what I had hoped for, and I have to start over with another set of four. 
 

This strategy has certainly worked well for me.  I get exactly what I want—because I tried it in MY SYSTEM.  No surprises.  No disappointment.  
 

(Plus, the Cable Co. applies the rental fee to your purchase, so no loss.)

"Do I need upgraded power cables?"

Tangible “upgrade” sure, go for it!

Cable has to be compliant with manufacturer's IEC design, safety / UL is important too. 

@mrdecibel ​Thanks for the tip regarding the Preffair Power Cords. I will probably give them a try. I've read about the possible differences between gold-plated and rhodium. Do you have any comment on the Preffair Carbon Fiber cable? Thanks​​​​​​

I admit it is awfully impressive for any company to make a power cable that looks this good for under $80, but use some common sense. 

Just the knock-off connectors are look alike Furutech FI-50 connectors which retail for several hundred dollars- each. It is not possible this cable uses any sort of quality, I guarantee they don’t use red copper, it is not 99.998 % pure, and the carbon fibre is plastic. The website pictures aren’t even real pictures. Pure lies and deception. 

Preffair = Chinese knock off. I don’t know why anyone would support this.