[操作疑難] 顯卡比較?

1)sapphire藍寶石r9 270 2gb gddr5 dual x dvi hdmi dp w boost&oc 定
2)GIGABYTE GV-R927OC-2GD R9 270 2GB GDDR5 OC HDMI+DP+DVIx2 Video Card
邊隻比較好?