Is there a list of compatible DDR4 memory for the Aurora R7, one that lists incompatible memory would be useful too. I'm looking at 2x8gb modules (unless it is better to get 4 x 4GB?) , 2666 MHz speed and there is a vast number to choose from - don't want to buy and find out it isn't compatible.

sites I'm looking at is scan.co.uk:  https://www.scan.co.uk/shop/computer-hardware/memory-ram/1737/1955

overclockers.co.uk: https://www.overclockers.co.uk/pc-components/memory/ddr4/ddr4-2666-mhz

maybe amazon/ebay