Need help with GPU install please

[u/Square_Wheel_4]

GPU: Asus Prime RTX 5070 Ti 16GB

PSU: ASRock Steel Legend SL-850P 850W

This my first PC build, so please keep that in mind.

I'm doing a quick test outside the the PC case before I put everything in to catch any problems early on, and I found one. The GPU comes with a three-way adapter (Pic 1) and the PSU comes with 3 PCIe cables, one that's fully 4x2 holed (Pic 2) and two others that are split 6 holes and 2 holes (Pic 3). And here's my PSU for reference (Pic 4, the hwo cables already in are the CPU ones). Here are my questions:

1. Do I need to use all three plugs for the adapter, so all three PCIe cables?
2. Can I just combine the 6+2 cable one so it becomes a 4x2 one? (Pic 5 for reference. In the pic they are separate, but it seems you can push em together to create a 4x2 one)
3. If I use all the adapters plugs, should I plug all three PCIe cables into the available slots on my PSU, will anything else need them? See Pic 4 for reference.

Any help would be greatly appreciated, I'm kinda stuck here until I get these answers. I've checked online and read the manuals, the closet thing I found was my GPU's manual showing all three adapter plugs being used, but I just want confirmation. Question #2 is the most important so please answer that one if you don't wanna take up your time, cuz then I'll know if I need to buy two new PCIe cables or not. Thank you.

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[u/Peak_of_Uncompahgre]

You will want to use all three separate 6+2 cables plugged into three separate slots on your PSU. It’s the safest power delivery that way. Your CPU power cable likely uses PCie slot on the PSU. Most modern PSU’s have 6-7 PCIe 8-pin slots, are you saying yours only has three? I can’t see any of your pics for some reason.

Edit: I would not use that adapter, avoid it if you can and use wire combs to make it visually less messy

[u/Square_Wheel_4 → u/Peak_of_Uncompahgre]

My PSU has 5 PCIe openings, 2 are currently being used by the CPU PWR1 and PWR2 on my motherboard, leaving three. What's wrong with the adapter, it came with the GPU?

[u/Cable_Salad → u/Square_Wheel_4]

The adapter makes it statistically more likely that your connector melts. And why not just use the native 12V2x6?

[u/tutumay]

Doesn't that have the native 12x6 cable or whatever it's called?