Hello, I am working mainly on my macbook Pro, but since I was in need of using bootcamp, I am in need of my old Mac Pro 5.1 (3.3mhz hexacore), with my old radeon 5770 GPU. However, I cannot use my 4K screen with it and I need a boot of power. I went through this forum and the GTX 980 interested me, but almost impossible to find. So, I would need your advice for an upgrade, considering: - No need of external power - Need to have a 4K resolution on 1 screen. - Compatible with boot camp - Ready to plug in (software update OK). - Can remove my 5770 to free power and space... Thank you for your recommendations!