What power cord do you use for your processor?

Transparent Premium power cord. Tried, a bunch of Cardas, Wireworld, DH Labs, JPS. 

Used Audioquest NRG-4 power cord.  Chop the ends and put on Furutech FI-15 Rhodium connectors.

Did the use of a better power cable help the sound coming out of the processor?
 

seems this would be a good place to put a power cord due to the noise generated from within the processor

Yes, absolutely helped the sound quality.  This is true for upgrading power cord on any audio equipment. 

As far as "noise generated within the processor", that depends highly on processor architecture and things like cheap capacitors or switching power supplies.

But in general, you are more likely to get "noise" from bad sources such as cable/satellite receivers and roku/apple streaming devices that use wall-wart type switching power supplies.

I use an PS Audio AC10 on my Marantz 8805 and yes it makes a significant difference.