Going to get a graphics card tomorrow and can't decide between these two. From what I can see in the benchmarks the MSI framerate is slightly better then then the ASUS 660. I am running an ASUS board so there are some advantages to going with the ASUS and it's BIOS integration from what I have seen. Here are the exact cards at Frys, bottom of the ad. Maybe neither one is that much of a jump from the Intel HD 4600 graphics ? Also wondering about the Mantle support with the R9 if that is of any use.
270x is faster, 660 is cheaper.......
any dedicated graphics card is a major jump from intel graphics.
you have another thread with a near identical question, no need for another thread really.
mantle support will be of use for mantle supported games, of which there is none yet, but bf4 and thief will support mantle at some stage. and it will increase performance.