|Very unlikely and not cost effective.|
A motherboard capable of using 4 Mbs of RAM is going to need different RAM and and a different CPU.
And why 4 Gbss. 4 Gbs of RAM is only of any use is you are running a 64 bit OS. A 32 bit OS will only use around 3 Gbs of RAM.
You would be better of buying a new computer.