I have (well had) three 3GB GTX 580's and I sent one to EVGA to get a replacement and they are sending me a 4GB GTX 960. My remaining two 3GB GTX 580's are faster than the single GTX 960. Can I keep using my two 3GB GTX 580's in SLI and then just output 4K using the 4GB GTX 960? So 580's for the graphics and the 960 to output 4K (Via HDMI 2.0).