Its actually 2x RX580. 1x Dell RX580 and 1x Sapphire Radeon NITRO+ RX 580. The system is a new Dell Inspiron Gaming Desktop with X370 mainboard. I switched the PSU in order to run two RX580. Unfortunately I had to remove the back plastic in order to fit a different PSU (the Dell one didn't have an ON/OFF switch). On the day I ordered the system there was no 850W PSU available to select. But all good and all runs fine.