I have a single msi 660 oc twin frozr iii, in the foreseeable future I was thinking of getting another one so I can set them up in sli. Now the question I'm asking is will that be sufficient for playing most games on the future? I mainly play fps, bf3. Looking to be able to run bf4 on ultra once their requirements come out. Or should I dish out the big money for one single card? I have an i5-3570k and 8 gb ram. Also have a 144 hz monitor.