Im getting an R9 270x but I dont know which brand to get, they both come with battlefield 4
Im no good at overclocking so they will stay as they are, but I dont know which one is better
Can someone also tell me what the "Boost clock" means?
The small difference in clock speed will make a small difference, yes. I don't know if it is enough to tell if they were used side by side tho. I have had excellent luck with both brands. Just be sure the longer card will fit your case w/o running into drives or something.
I have a pair of older MSI GTX 660 OC cards in my system now. I like the over-sized pipes they put in the heat sync.