Hellfire, cmon man, take some advice.
Theoretically 4GB of RAM will work, but is it optimal?
No.
The power supply you've listed isn't good for the load that it will be handling unless you want fried components.
The only build I would even consider using that in is a basic workstation PC with no GPU.
I've put in 16GB of RAM and a better power supply for quite a bit less, just go with it please.