I am doing calibration on my PC monitor as well with an i1 Display ProPlus w/ DisplayCAL and cabling unfortunately makes a visual difference, possibly measureable, on both on my monitor and TV. DP/HDMI cables, power cables and sockets/outlets, AC filters, ethernet cables, switches and their power supplies, hell even a PCI filter like the Elfidelity one, they all did make a difference for me and there are a lot of people reporting similar. I really wish it wasn't the case and i understand people who want to draw a line, as it is a costly and time-consuming headache to tune systems for both sound and picture. In short, enter this rabbithole at your own peril.
Let me re-state what I said.... not buying expensive power cables to install on a PC, whether the power supply or the monitor.
And for clarity...I didn't say anything about a T.V, HDMI cables, or any other cable for that matter. Strictly desktop PC's and power cords. And
THAT, is where I said see zero reason to buy and install a high-performance power cord. Please re-read my post.
At the end of the day, electrical component changes will have an effect on a system. It's just a matter of how noticeable it is and is it good or bad. I see very little gain where slapping a performance power cord on a power supply or monitors is worth that added expense.
Anyway, I'm keenly familiar with X-Rite's i1 Display software and the accompanying hardware puck aka colorimeter as I've used that system. My NEC monitor however has its own built-in LUT table, so it uses its own calibration software in SpecraView II while also supporting (allowing use of) X-Rite's i1 Display colorimeter. Tis no rookie here.
And again, I've been building PCs (high end) for over 25 years, last build in 2019, next built later this year. I'm also in a few tech forums
where I post my builds. In all that time, none of us has ever mentioned or felt the need to buy a "premium power cord" for our systems. And most of us
are performance freaks and serious gamers (me).
As an also hi-fi enthusiast, I do understand the merits of adding performance cables, PC power cords, nah. But as you say.... "
enter this rabbithole at your own peril".
BTW, this is not to say adding audio performance cables from your PC's sound card, USB port, can't help, it does, and I did. Not power cords.
Peace