You better ask in the Premiere forums.
Moving this discussion to the Premiere Pro forum.
It'll work fine.
Depends on the rest of the system specs. Jim is right that it works great, but on system A it is overkill, on system B it is just right and on system C it is very weak.
System A: AMD dual core, 4 GB memory, single disk, the 560 Ti is way overkill. A GT 630/DDR5 is enough.
System B: Intel 4 core with HT, 16 GB, three disk, the 560 TI is the perfect video card.
System C: Dual 8 core Xeons with HT, 64 GB, large raid array, the 560 TI is underpowered, the Titan would be better.