Upgrading power cables

(1) Source / cdp first, Full stop ..... in my direct and indirect experiences. The better the spinner unit, the more graphic the cable choice sensitivities and the degree of improvement with your selection of cable in matched lockstep to the choice of your ICs.

(2) it's no guarantee of automatic nirvana that all the components have to be all from the same PC brand. It's strongly suggested that you upgrade them all in the same manner as you did with the power amp: via an A-B direct shootout bake-off. Admittedly, it's a good start to include your amp power cord brand in your selection criteria.... However, Power cables -- like all cables-- , have a sonic signature that can be very system dependent. 

(3) Raw price point in PCs is no yardstick selection criteria for audio improvement nirvana. Similarly mega-brand units won't guarantee any upgrade either.

For example, with my $12K spinner, the OEM supplied power cord (a quality build kit itself in the $300 range) was put to a direct bake-off against some quality-build units from heavyweight brands  such as FURUTECH, SHUNYATA,  OYAIDE, LFD, ATLAS, ECOSSE, JPS and others. Many of the latter retail up to the G-note price strata.

The dealer recommended that I stick with the OEM unit .... He was right ... It bested all the contenders and pretenders with MY kit, and absolutely smoked some of the mega-priced brands. The latter do yeoman service now in my B-system ... They just did not work in my A-system.

Addendum

if you have not yet run in dedicated power lines from the breaker panel to yiur listening room  and also added on either hospital grade or audiophile grade receptacles, then don't blow a lot of money on new power cords now.

It is intuitive... Improve it on a cradle-to-grave approach.  

A dedicated power line system will give you the performance improvements expressed in multiples when compared to just the "new" power cord inserted by itself  at the end in a "standard" power line feed.

when it comes to power cords, i like to upgrade the amplifier cord first.. the amp is the most power hungry of all plus i like to make sure i'm not short changing everything in front or behind the amp source with an amp that's not getting enough electricity.. 

Treadman, the range of improvement that cab be achieved is quite varied in different ways...

• Very modestly priced components, like my Schiit Bifrost DAC, achieved a significantly higher level of performance with good power and interconnects nectcables
  
• Higher resolution components tend to exhibit more modest levels of improvements, like my Simaudio MOON phono stage. But then you start to hear an improved level of refinememt i.e. resolution
  
• My Naim 5i amp, having the best power supply of all, probably exhibited the least amount of improvement, but again, the level of refinement or resolution has exceeded my expectations considerably.
  

So even though the individual amount of improvement may appear to differ, the overall improvement of the system justified the investment in power cable upgrades for all components in my case.

Regards

Thanks for so many informed responses!