I have built a super quite single card headless miners. Gen Ethos for the os. Very little heat and not louder than a regular PC. Used a Dell Inspiron 530 computer with a Asus R9 380x. Got a free PSU from Amazon after they sent me two when I only paid for one PSU. Computer I got from an electronics recycling dumpster for free. Total cost for the setup was $50 and that was for the Asus R9 380x off a guy on craigslist. Does about 16 Mh/s for Eth. Not much I know but it's quite as a mouse and little to no heat generated. Since it is headless, no monitor required and I can go to it's ip address and pull up a web interface to see it's stats.
And you told Amazon about PSU and Amazon lets u have it for free or you just exploit their very good reputation in customer service and assumed Amazon will let u to have it for free
This situation on amazon often happens weather you want to or not... lol
Recently I bought a NGFF M.2->USB WWAN adapter and it did not power on when hooked up like the miniPCIE/USB WWAN adaptors.... the seller asked me what WWAN card I was using, and when I stated LM7355, I was promptly given a refund saying incompatible device.
Two days od driver fiddling later; the whole contraption works and powers up. $25 saved.....