I'm using that driver with a 560 Ti, no issues.
The 650M comes in two varieties. One with 512 VRAM and one with 2 GB VRAM. Can you determine which one it is for us?
Mine is working fine.
NVIDIA GeForce GT 650M 2GB
Geforce 320.18 drivers
It´s a 2gb version on a samsung chronos serie 7.
Premiere cs6 works fine.