I want to get a GPU thats VR-Ready but i have 2 cards that are really good but i don't know which one to choose,the R9 fury x has 4 gbs of vram but its HBM when the R9 390X has 8 GBs of VRAM but it's GDDR5,the R9 fury x is more expensive by 50-70 euros,can you help me out?