You don't even need a GTX680 to do 4x IR and 9x SSAA, as I can do that on my HD6950. It will go up to 4x and 16x, though, which mine can't. Basically, it isn't a necessary upgrade, and if you do it it will only make things look prettier without a performance boost.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
