should i go with buying another radeon hd 6950 1gb or should i buy a r9 270x if i buy another radeon 6950 ill put it in crossfire but im not sure if thats the best idea since these newer cards are gonna support certain things like direct x 12 what should i do?? my specs amd fx4130 quad core processor a gigabyte radeon hd 6950 1gb 8 gb corsair vengance 64 gb crucial m4 ssd a 500 gb samsung hdd 7200 rpm a msi 970a-g46 motherboard and a chieftec 850 watt psu