A:AnswerHi SaulGoodman,
The cables on the RM750 are Type 4, so the ATX 24-pin would not be compatible with the HX850i which is Type 3. If you'd like help, please reach out to our support team: support.corsair.com
-Brian
A:AnswerI am not sure what else you are using in your set up but if your running the 6800xt you should be fine with a 750w. The 6800 xt is listed to draw around 300W but more like 400w if you will be overclocking. if your case can fit a 750w or even a 850w I would go with that. I always like to tell people, you want to buy something you will grow into, not grow out of. Who knows what you will add to your pc setup down the road so having a little extra reserve power for the future will only benefit you. Hope this helps.
A:AnswerYes, I have a RTX 3080. If you have a 3080 or 3090, it is recommended to run two separate cables from the PSU and not to use the piggy back attached to the cable.
