I can get these cards for 400 EUR. ASUS Radeon RX 570 Expedition OC edition 4GB GDDR5 256bit - EX-RX570-O4G AMD Radeon RX 570, 4GB, GDDR5, PCI Express 3.0
I want to build four 6GPU rigs. Any kind of info. can help, thanks!
The cards themselves seem fine. Make sure you buy name-brand power supplies and have the capacity to handle that many GPUs. You might also want to look in to using HP 1200 server power supplies. They are inexpensive when compared to regular PC power supplies.