If someone is concerned about aftermarket cables, you can always sleeve your OEM cables.   It's actually quite easy and cheap as long as your careful.  The Youtube channel Optimum Tech did a great video on the process.  I don't have enough posts to hyperlink yet, but just search youtube for Optimum Tech and Sleeving, and it will come up.   He probably makes the best small form factor content on Youtube as well. 

Mod-one is another option. You have the option of a thicker gauge as well. Can't imagine your going to see any benefit of it, but it's an option.

For those interested, this person solved their random reboot problem by swapping to stock cables from cablemod ones for his 1000W seasonic prime titanium PSU (and his old 2080 Ti and 2080 Super worked fine with the cablemod cables):
 
https://hardforum.com/threads/troubleshooting-request-3080-fe-reboots.2002859/post-1044786426
 

jankerson
 
Not the 1st time I have heard about problems with them..

The kinda crazy part is that it was a 3090 FE, which has a 370W max power draw with the power slider maxed out. So many folks out there with 3080 FTW3s with 420W stock or 450W XOC, and 3090 FTW3 owners with 450W stock and 500W XOC.
 
It might look bad, but if the wire size is smaller than the stock cables to make cable management easier - it's doing you no favors for stability with these higher wattage cards.

arestavo

jankerson
 
Not the 1st time I have heard about problems with them..

The kinda crazy part is that it was a 3090 FE, which has a 370W max power draw with the power slider maxed out. So many folks out there with 3080 FTW3s with 420W stock or 450W XOC, and 3090 FTW3 owners with 450W stock and 500W XOC.
 
It might look bad, but if the wire size is smaller than the stock cables to make cable management easier - it's doing you no favors for stability with these higher wattage cards.

 
Could be a variety of things really, cable size, pin quality, connector quality.
 
Who knows, I have always stayed clear of them personally so I can't speak about them from 1st hand experience. 
 
Could also be missing caps in the cables for PSU models that actually have caps in the OEM cables.
 
Like Corsair Type 4 as an example.
 
 

The only time Cablemod or other cables could be a issue with a quality PSU is if the Manufacture of the PSU has installed caps in the ends of the cables they include with the PSU. Some Manufactures do this to smooth out voltage ripple. So if you use different cables that do NOT have the caps in the cable ends, you could possibly be allowing excess voltage ripple to make it to your components. I currently have a EVGA G3 1000watt power supply, which I purchased EVGA mod cables when I bought it. It does NOT have caps on the original cables nor the mod cables. Some some thoughts on the issue some may be having with powering high end cards. As when the Amperage and wattage draw goes up so does the AC ripple on the power lines to the graphics card.

I have an RM850x with Cablemod cables. They work flawlessly, but they are designed for each specific PSU. You cannot swap them around with other PSU's. Also they have the capacitors Corsair puts in the stock cables to filter noise as well, so they are very nice replacements.

This is in no way 100%, but based on my experience there is a chance aftermarket cables can damage your PSU or components. 
 
It's a long story that spans many years, but to summarize:
 

• Used the Cablemod custom sleeved cables with my Corsair AX1200i
• As soon as receiving them, system won't post properly. Checked the cable, and one of the PCI-E cable seemed to be faulty.
• Got a replacement, and all was good. 
• After a couple of years, the system randomly shut off and wouldn't boot back up. 
• Contacted Corsair and they shipped out a replacement unit right away. 
• All was good again until some time later it did the same exact thing. 
• Contacted Corsair and they shipped out a replacement unit right away again. (Gotta love Corsair support)
• All was good until recently it freaking happened again. I've had the AX1200i replaced with a brand new unit twice, and I realized it was something else. The only thing consistent between all of the failures is the custom cables. I've went through a total system upgrade, so it was not likely any of the other components. 
• Contacted Cablemod and they basically said too bad, I'm out of warranty period. And that it is likely the power supply's fault. I'm totally fine not getting warranty service as it is beyond the period. But at the same token, it's disappointing seeing that they won't even put in the effort to investigate the issue. Even if not providing warranty service, I at the least expected them to send me a return label so I can send it in for them to inspect it for any faults.

https://www.overclock.net/threads/cablemod-cables-melted-into-psu.1776231/

I’m going Titan Rig for my custom cables. Don’t trust Cable Mod anymore

The failures come from cheap cables/extensions that have 20-22awg wires. Plus dont daisy chain pcie power cables.