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My CPU is Ryzen 3800X and with the cooler installed I hover from 38c-50c when idle. I assume it's not normal for the range to be that high so perhaps something is wrong? I also ran burntest and maxed out at 77c which I believe is normal. What do you all think?

My 570X's RGB fan controller is kind of broken where the extra slots not used by the included fans don't work (one will only display a color but will not allow cycling to others, and the other two just don't light up anything). Is there a way I can troubleshoot this or do I need to replace it if I want full RGB control? Is replacing this unit in the case hard? Any guidance on this would be appreciated!

I have this semi modular PSU and I wanted to purchase THIS braided cable set from Corsair to make my new build look way cleaner. Is the right set in terms of generation and does this come with everything I need? Since mine is semi modular, all I need to swap out is everything but the main 24pin power cable for the mobo, correct?

My friend is looking to sell me his 570x case for my black friday build and he might not have all the PCI rear plates. I definitely want to make sure I have a good seal from dust in the rear so I'm looking on Corsair's shop to see if they sell any. I see some for other cases but are the plates from those the same as the 570x? If there are any experts that can chime in this niche detail, that'd be great.