Honestly, grab the CableMod RT-Series Pro ModMesh 12VHPWR Cable. It is super flexible and makes cable management way easier than those stiff stock adapters. I am really satisfied with mine.

Adding my two cents here, because those stock adapters are genuinely scary. Are you using a modular power supply or still relying on that extension adapter that came with the card? Be really careful with the bend radius near the connector, honestly. I wouldnt risk a cheap extension if you can help it. If you want something that actually bends without feeling like you are gonna snap the pins, I suggest looking into the Corsair Premium Individually Sleeved 12VHPWR Cable Type 4. It is much more pliable than the stock stuff. Just make sure your specific PSU model is compatible with their Type 4 ecosystem first. Dont force anything into the port, make sure that click is solid. It is way better to spend a bit more on a direct cable than dealing with a melted connector later.

Saw your post earlier but got caught up with some stuff. Honestly, managing those 12VHPWR cables is a nightmare for almost everyone. When I first swapped to a 40-series card, I was terrified of bending the stock adapter too much and causing a fire hazard, so I just spent way too much time trying to route it behind the motherboard tray. My current setup uses a set of aftermarket sleeved extensions I picked up on a whim. They are definitely more pliable than the stock stuff, which made closing my side panel a million times easier. Here is what I learned from my own build process:

• The thinner the wire gauge on the sleeves, the easier it is to route, but you need to make sure they are rated for the wattage.
• Using a comb is actually a lifesaver, even if it feels like a pain to set up initially. It keeps the wires from crossing over each other and creating those weird, bulky lumps.
• Try routing the cable underneath the GPU instead of over it, as that creates a more natural curve and keeps it away from the side glass. It took me a few tries to get the tension right without feeling like I was putting stress on the header. Just take your time and dont force it if it feels like it wants to pop out. If you end up finding something that fits your case, let us know how it goes!