What do you think about this Graphic Card:
MSI GAMING Radeon RX 480 GDDR5 8GB CrossFire VR Ready FinFET DirectX 12 Graphics Card (RX 480 GAMING X 8G)
https://www.amazon.com/MSI-GAMING-RX-480-8G/dp/B01K1JTT8S/ref=sr_1_1?ie=UTF8&qid=1494955415&sr=8-1&keywords=Radeon+R9+390

and also which one is better for mining:
MSI GAMING Radeon RX 480 GDDR5 8GB CrossFire VR Ready FinFET DirectX 12 Graphics Card (RX 480 GAMING X 8G) this one or
Gigabyte GeForce GTX 1070 8 GB GDDR5 256 bit PCI-E 3.0 x 16 Windforce OC (GV-N1070WF2OC-8GD) this.