Consider the RX480. I've put it in three different desktops as upgrades. The last one in a Lenovo x315 desktop with an AMD FX770K quad core CPU running 3.9 Ghz max. 16 Gb ram. Driving a Seiki 42" TV at full 4K 60 fps on HDMI 2.0 port. Gaming is fantastic. Had to remove the old GPU and add one external power supply for the 6 pin power.