It's not going to run well, it will run like crap, it will run on probably less than 10FPS on the lowest settings possible.
I'm assuming you are talking about the build I posted.
The processor's onboard GPU doesn't have its own video dedicated RAM, it uses RAM from the RAM sticks in the motherboard (or so I've heard), and with 8 gb of RAM for the whole computer, I'm guessing it would use about 2 gb of RAM just for the onboard GPU.
Please correct me if I am wrong.