This setup would likely run smoothly on Windows 8.1 with the stock MOBO, RAM, and CPU configurations.
It makes no sense to question this.
If it comes with 64-bit drivers, you should be able to use it. Otherwise, you'll face problems.
I’d opt for simplicity and go with a straightforward 750 ti.
It currently includes Windows 7 64-bit version.
It should work fine then.