Hello,
Is it possible to get a mining rig and install different GPU brands to mine? For example I want to buy a rig and then install AMD(550, radeon 6800xt) & Nvidia (2080, 3070, 3090). Would it be possible to have different GPU's hooked to a rig?
Yes it is possible. I mined Ethereum for years with rigs that had 7x1070ti and 6xRX580 connected to an Asus M250 Mining Expert Motherboard. Each rig had 4 high efficiency power supplies. OS was Windows 10. I still have the rigs, they are just currently shut off. I need to clean them. It all still works. I had one RX580 failure and two 1070ti. Still need to try and repair them.