The RX480 drew more than 75W from the PCIe slot, and that was fixed with a driver update. So I would assume that power use is driver related. I'm not sure about a 35W limit on a PCIe slot. I've never heard of this.
As for not banning you of that I'm also not sure. I'll forward your name to the mod committee and see what they say. You've gone and made ANOTHER thread on the weird system you have. To be completely honest with you, you would have been better off getting rid of that odd OEM unit and just get a normal system that uses normal PSU. (He has an odd non standard with that powers the motherboard with a 6 or 8pin plug, not the normal 20/24pin ATX plug we are used to.) By opening thread after thread looking for advice on what to do, most without information about your system so you get the normal replies of "just upgrade your PSU" you are doing nothing but spamming our forum with usless junk. Frankly I'm trying to figure out why you haven't done ANYTHING yet seeing as you've been asking for months.